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mariadb/sql/sys_vars.cc
Alexander Nozdrin 7973ab7c36 Auto-merge from mysql-next-mr.
2010-01-11 16:10:51 +03:00

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/* Copyright (C) 2002-2006 MySQL AB, 2009-2010 Sun Microsystems, Inc.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; version 2 of the License.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
How to add new variables:
1. copy one of the existing variables, and edit the declaration.
2. if you need special behavior on assignment or additional checks
use ON_CHECK and ON_UPDATE callbacks.
3. *Don't* add new Sys_var classes or uncle Occam will come
with his razor to haunt you at nights
Note - all storage engine variables (for example myisam_whatever)
should go into the corresponding storage engine sources
(for example in storage/myisam/ha_myisam.cc) !
*/
#include "sys_vars.h"
#include "events.h"
#include <thr_alarm.h>
#include "slave.h"
#include "rpl_mi.h"
#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
#include "../storage/perfschema/pfs_server.h"
#endif /* WITH_PERFSCHEMA_STORAGE_ENGINE */
/*
The rule for this file: everything should be 'static'. When a sys_var
variable or a function from this file is - in very rare cases - needed
elsewhere it should be explicitly declared 'export' here to show that it's
not a mistakenly forgotten 'static' keyword.
*/
#define export /* not static */
#ifdef WITH_PERFSCHEMA_STORAGE_ENGINE
#define PFS_TRAILING_PROPERTIES \
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(NULL), ON_UPDATE(NULL), \
0, NULL, sys_var::PARSE_EARLY
static Sys_var_mybool Sys_pfs_enabled(
"performance_schema",
"Enable the performance schema.",
READ_ONLY GLOBAL_VAR(pfs_param.m_enabled),
CMD_LINE(OPT_ARG), DEFAULT(FALSE),
PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_events_waits_history_long_size(
"performance_schema_events_waits_history_long_size",
"Number of rows in EVENTS_WAITS_HISTORY_LONG.",
READ_ONLY GLOBAL_VAR(pfs_param.m_events_waits_history_long_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_WAITS_HISTORY_LONG_SIZE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_events_waits_history_size(
"performance_schema_events_waits_history_size",
"Number of rows per thread in EVENTS_WAITS_HISTORY.",
READ_ONLY GLOBAL_VAR(pfs_param.m_events_waits_history_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024),
DEFAULT(PFS_WAITS_HISTORY_SIZE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_cond_classes(
"performance_schema_max_cond_classes",
"Maximum number of condition instruments.",
READ_ONLY GLOBAL_VAR(pfs_param.m_cond_class_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 256),
DEFAULT(PFS_MAX_COND_CLASS),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_cond_instances(
"performance_schema_max_cond_instances",
"Maximum number of instrumented condition objects.",
READ_ONLY GLOBAL_VAR(pfs_param.m_cond_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_COND),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_file_classes(
"performance_schema_max_file_classes",
"Maximum number of file instruments.",
READ_ONLY GLOBAL_VAR(pfs_param.m_file_class_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 256),
DEFAULT(PFS_MAX_FILE_CLASS),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_file_handles(
"performance_schema_max_file_handles",
"Maximum number of opened instrumented files.",
READ_ONLY GLOBAL_VAR(pfs_param.m_file_handle_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_FILE_HANDLE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_file_instances(
"performance_schema_max_file_instances",
"Maximum number of instrumented files.",
READ_ONLY GLOBAL_VAR(pfs_param.m_file_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_FILE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_mutex_classes(
"performance_schema_max_mutex_classes",
"Maximum number of mutex instruments.",
READ_ONLY GLOBAL_VAR(pfs_param.m_mutex_class_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 256),
DEFAULT(PFS_MAX_MUTEX_CLASS),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_mutex_instances(
"performance_schema_max_mutex_instances",
"Maximum number of instrumented MUTEX objects.",
READ_ONLY GLOBAL_VAR(pfs_param.m_mutex_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_MUTEX),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_rwlock_classes(
"performance_schema_max_rwlock_classes",
"Maximum number of rwlock instruments.",
READ_ONLY GLOBAL_VAR(pfs_param.m_rwlock_class_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 256),
DEFAULT(PFS_MAX_RWLOCK_CLASS),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_rwlock_instances(
"performance_schema_max_rwlock_instances",
"Maximum number of instrumented RWLOCK objects.",
READ_ONLY GLOBAL_VAR(pfs_param.m_rwlock_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_RWLOCK),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_table_handles(
"performance_schema_max_table_handles",
"Maximum number of opened instrumented tables.",
READ_ONLY GLOBAL_VAR(pfs_param.m_table_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_TABLE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_table_instances(
"performance_schema_max_table_instances",
"Maximum number of instrumented tables.",
READ_ONLY GLOBAL_VAR(pfs_param.m_table_share_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_TABLE_SHARE),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_thread_classes(
"performance_schema_max_thread_classes",
"Maximum number of thread instruments.",
READ_ONLY GLOBAL_VAR(pfs_param.m_thread_class_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 256),
DEFAULT(PFS_MAX_THREAD_CLASS),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
static Sys_var_ulong Sys_pfs_max_thread_instances(
"performance_schema_max_thread_instances",
"Maximum number of instrumented threads.",
READ_ONLY GLOBAL_VAR(pfs_param.m_thread_sizing),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 1024*1024),
DEFAULT(PFS_MAX_THREAD),
BLOCK_SIZE(1), PFS_TRAILING_PROPERTIES);
#endif /* WITH_PERFSCHEMA_STORAGE_ENGINE */
static Sys_var_ulong Sys_auto_increment_increment(
"auto_increment_increment",
"Auto-increment columns are incremented by this",
SESSION_VAR(auto_increment_increment),
CMD_LINE(OPT_ARG),
VALID_RANGE(1, 65535), DEFAULT(1), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG);
static Sys_var_ulong Sys_auto_increment_offset(
"auto_increment_offset",
"Offset added to Auto-increment columns. Used when "
"auto-increment-increment != 1",
SESSION_VAR(auto_increment_offset),
CMD_LINE(OPT_ARG),
VALID_RANGE(1, 65535), DEFAULT(1), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG);
static Sys_var_mybool Sys_automatic_sp_privileges(
"automatic_sp_privileges",
"Creating and dropping stored procedures alters ACLs",
GLOBAL_VAR(sp_automatic_privileges),
CMD_LINE(OPT_ARG), DEFAULT(TRUE));
static Sys_var_ulong Sys_back_log(
"back_log", "The number of outstanding connection requests "
"MySQL can have. This comes into play when the main MySQL thread "
"gets very many connection requests in a very short time",
READ_ONLY GLOBAL_VAR(back_log), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 65535), DEFAULT(50), BLOCK_SIZE(1));
static Sys_var_charptr Sys_basedir(
"basedir", "Path to installation directory. All paths are "
"usually resolved relative to this",
READ_ONLY GLOBAL_VAR(mysql_home_ptr), CMD_LINE(REQUIRED_ARG, 'b'),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_ulong Sys_binlog_cache_size(
"binlog_cache_size", "The size of the cache to "
"hold the SQL statements for the binary log during a "
"transaction. If you often use big, multi-statement "
"transactions you can increase this to get more performance",
GLOBAL_VAR(binlog_cache_size),
CMD_LINE(REQUIRED_ARG),
VALID_RANGE(IO_SIZE, ULONG_MAX), DEFAULT(32768), BLOCK_SIZE(IO_SIZE));
static bool check_has_super(sys_var *self, THD *thd, set_var *var)
{
DBUG_ASSERT(self->scope() != sys_var::GLOBAL);// don't abuse check_has_super()
#ifndef NO_EMBEDDED_ACCESS_CHECKS
if (!(thd->security_ctx->master_access & SUPER_ACL))
{
my_error(ER_SPECIFIC_ACCESS_DENIED_ERROR, MYF(0), "SUPER");
return true;
}
#endif
return false;
}
static bool binlog_format_check(sys_var *self, THD *thd, set_var *var)
{
if (check_has_super(self, thd, var))
return true;
if (var->type == OPT_GLOBAL ||
(thd->variables.binlog_format == var->save_result.ulonglong_value))
return false;
/*
If RBR and open temporary tables, their CREATE TABLE may not be in the
binlog, so we can't toggle to SBR in this connection.
*/
if ((thd->variables.binlog_format == BINLOG_FORMAT_ROW) &&
thd->temporary_tables)
{
my_error(ER_TEMP_TABLE_PREVENTS_SWITCH_OUT_OF_RBR, MYF(0));
return true;
}
/*
if in a stored function/trigger, it's too late to change mode
*/
if (thd->in_sub_stmt)
{
my_error(ER_STORED_FUNCTION_PREVENTS_SWITCH_BINLOG_FORMAT, MYF(0));
return true;
}
return false;
}
static bool fix_binlog_format_after_update(sys_var *self, THD *thd,
enum_var_type type)
{
if (type == OPT_SESSION)
thd->reset_current_stmt_binlog_row_based();
return false;
}
static Sys_var_enum Sys_binlog_format(
"binlog_format", "What form of binary logging the master will "
"use: either ROW for row-based binary logging, STATEMENT "
"for statement-based binary logging, or MIXED. MIXED is statement-"
"based binary logging except for those statements where only row-"
"based is correct: those which involve user-defined functions (i.e. "
"UDFs) or the UUID() function; for those, row-based binary logging is "
"automatically used. If NDBCLUSTER is enabled and binlog-format is "
"MIXED, the format switches to row-based and back implicitly per each "
"query accessing an NDBCLUSTER table",
SESSION_VAR(binlog_format), CMD_LINE(REQUIRED_ARG, OPT_BINLOG_FORMAT),
binlog_format_names, DEFAULT(BINLOG_FORMAT_STMT),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(binlog_format_check),
ON_UPDATE(fix_binlog_format_after_update));
static Sys_var_ulong Sys_bulk_insert_buff_size(
"bulk_insert_buffer_size", "Size of tree cache used in bulk "
"insert optimisation. Note that this is a limit per thread!",
SESSION_VAR(bulk_insert_buff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(8192*1024), BLOCK_SIZE(1));
static Sys_var_charptr Sys_character_sets_dir(
"character_sets_dir", "Directory where character sets are",
READ_ONLY GLOBAL_VAR(charsets_dir), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static bool check_not_null(sys_var *self, THD *thd, set_var *var)
{
return var->value && var->value->is_null();
}
static bool check_charset(sys_var *self, THD *thd, set_var *var)
{
if (!var->value)
return false;
char buff[STRING_BUFFER_USUAL_SIZE];
if (var->value->result_type() == STRING_RESULT)
{
String str(buff, sizeof(buff), system_charset_info), *res;
if (!(res=var->value->val_str(&str)))
var->save_result.ptr= NULL;
else if (!(var->save_result.ptr= get_charset_by_csname(res->c_ptr(),
MY_CS_PRIMARY,
MYF(0))) &&
!(var->save_result.ptr= get_old_charset_by_name(res->c_ptr())))
{
ErrConvString err(res);
my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), err.ptr());
return true;
}
}
else // INT_RESULT
{
int csno= (int)var->value->val_int();
if (!(var->save_result.ptr= get_charset(csno, MYF(0))))
{
my_error(ER_UNKNOWN_CHARACTER_SET, MYF(0), llstr(csno, buff));
return true;
}
}
return false;
}
static bool check_charset_not_null(sys_var *self, THD *thd, set_var *var)
{
return check_charset(self, thd, var) || check_not_null(self, thd, var);
}
static Sys_var_struct Sys_character_set_system(
"character_set_system", "The character set used by the server "
"for storing identifiers",
READ_ONLY GLOBAL_VAR(system_charset_info), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(0));
static Sys_var_struct Sys_character_set_server(
"character_set_server", "The default character set",
SESSION_VAR(collation_server), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_charset_not_null));
static bool check_charset_db(sys_var *self, THD *thd, set_var *var)
{
if (check_charset_not_null(self, thd, var))
return true;
if (!var->value) // = DEFAULT
var->save_result.ptr= thd->db_charset;
return false;
}
static Sys_var_struct Sys_character_set_database(
"character_set_database",
" The character set used by the default database",
SESSION_VAR(collation_database), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_charset_db));
static bool check_cs_client(sys_var *self, THD *thd, set_var *var)
{
if (check_charset_not_null(self, thd, var))
return true;
// Currently, UCS-2 cannot be used as a client character set
if (((CHARSET_INFO *)(var->save_result.ptr))->mbminlen > 1)
return true;
return false;
}
static bool fix_thd_charset(sys_var *self, THD *thd, enum_var_type type)
{
if (type == OPT_SESSION)
thd->update_charset();
return false;
}
static Sys_var_struct Sys_character_set_client(
"character_set_client", "The character set for statements "
"that arrive from the client",
SESSION_VAR(character_set_client), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_cs_client),
ON_UPDATE(fix_thd_charset));
static Sys_var_struct Sys_character_set_connection(
"character_set_connection", "The character set used for "
"literals that do not have a character set introducer and for "
"number-to-string conversion",
SESSION_VAR(collation_connection), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_charset_not_null),
ON_UPDATE(fix_thd_charset));
static Sys_var_struct Sys_character_set_results(
"character_set_results", "The character set used for returning "
"query results to the client",
SESSION_VAR(character_set_results), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_charset));
static Sys_var_struct Sys_character_set_filesystem(
"character_set_filesystem", "The filesystem character set",
SESSION_VAR(character_set_filesystem), NO_CMD_LINE,
offsetof(CHARSET_INFO, csname), DEFAULT(&character_set_filesystem),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_charset_not_null),
ON_UPDATE(fix_thd_charset));
static const char *completion_type_names[]= {"NO_CHAIN", "CHAIN", "RELEASE", 0};
static Sys_var_enum Sys_completion_type(
"completion_type", "The transaction completion type, one of "
"NO_CHAIN, CHAIN, RELEASE",
SESSION_VAR(completion_type), CMD_LINE(REQUIRED_ARG),
completion_type_names, DEFAULT(0));
static bool check_collation_not_null(sys_var *self, THD *thd, set_var *var)
{
if (!var->value)
return false;
char buff[STRING_BUFFER_USUAL_SIZE];
if (var->value->result_type() == STRING_RESULT)
{
String str(buff, sizeof(buff), system_charset_info), *res;
if (!(res= var->value->val_str(&str)))
var->save_result.ptr= NULL;
else if (!(var->save_result.ptr= get_charset_by_name(res->c_ptr(), MYF(0))))
{
ErrConvString err(res);
my_error(ER_UNKNOWN_COLLATION, MYF(0), err.ptr());
return true;
}
}
else // INT_RESULT
{
int csno= (int)var->value->val_int();
if (!(var->save_result.ptr= get_charset(csno, MYF(0))))
{
my_error(ER_UNKNOWN_COLLATION, MYF(0), llstr(csno, buff));
return true;
}
}
return check_not_null(self, thd, var);
}
static Sys_var_struct Sys_collation_connection(
"collation_connection", "The collation of the connection "
"character set",
SESSION_VAR(collation_connection), NO_CMD_LINE,
offsetof(CHARSET_INFO, name), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_collation_not_null),
ON_UPDATE(fix_thd_charset));
static bool check_collation_db(sys_var *self, THD *thd, set_var *var)
{
if (check_collation_not_null(self, thd, var))
return true;
if (!var->value) // = DEFAULT
var->save_result.ptr= thd->db_charset;
return false;
}
static Sys_var_struct Sys_collation_database(
"collation_database", "The collation of the database "
"character set",
SESSION_VAR(collation_database), NO_CMD_LINE,
offsetof(CHARSET_INFO, name), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_collation_db));
static Sys_var_struct Sys_collation_server(
"collation_server", "The server default collation",
SESSION_VAR(collation_server), NO_CMD_LINE,
offsetof(CHARSET_INFO, name), DEFAULT(&default_charset_info),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_collation_not_null));
static const char *concurrent_insert_names[]= {"NEVER", "AUTO", "ALWAYS", 0};
static Sys_var_enum Sys_concurrent_insert(
"concurrent_insert", "Use concurrent insert with MyISAM. Possible "
"values are NEVER, AUTO, ALWAYS",
GLOBAL_VAR(myisam_concurrent_insert), CMD_LINE(OPT_ARG),
concurrent_insert_names, DEFAULT(1));
static Sys_var_ulong Sys_connect_timeout(
"connect_timeout",
"The number of seconds the mysqld server is waiting for a connect "
"packet before responding with 'Bad handshake'",
GLOBAL_VAR(connect_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(2, LONG_TIMEOUT), DEFAULT(CONNECT_TIMEOUT), BLOCK_SIZE(1));
static Sys_var_charptr Sys_datadir(
"datadir", "Path to the database root directory",
READ_ONLY GLOBAL_VAR(mysql_real_data_home_ptr),
CMD_LINE(REQUIRED_ARG, 'h'), IN_FS_CHARSET, DEFAULT(0));
#ifndef DBUG_OFF
static Sys_var_dbug Sys_dbug(
"debug", "Debug log", sys_var::SESSION,
CMD_LINE(OPT_ARG, '#'), DEFAULT(""), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_has_super));
#endif
/**
@todo
When updating myisam_delay_key_write, we should do a 'flush tables'
of all MyISAM tables to ensure that they are reopen with the
new attribute.
*/
export bool fix_delay_key_write(sys_var *self, THD *thd, enum_var_type type)
{
switch (delay_key_write_options) {
case DELAY_KEY_WRITE_NONE:
myisam_delay_key_write=0;
break;
case DELAY_KEY_WRITE_ON:
myisam_delay_key_write=1;
break;
case DELAY_KEY_WRITE_ALL:
myisam_delay_key_write=1;
ha_open_options|= HA_OPEN_DELAY_KEY_WRITE;
break;
}
return false;
}
static const char *delay_key_write_names[]= { "OFF", "ON", "ALL", NullS };
static Sys_var_enum Sys_delay_key_write(
"delay_key_write", "Type of DELAY_KEY_WRITE",
GLOBAL_VAR(delay_key_write_options), CMD_LINE(OPT_ARG),
delay_key_write_names, DEFAULT(DELAY_KEY_WRITE_ON),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_delay_key_write));
static Sys_var_ulong Sys_delayed_insert_limit(
"delayed_insert_limit",
"After inserting delayed_insert_limit rows, the INSERT DELAYED "
"handler will check if there are any SELECT statements pending. "
"If so, it allows these to execute before continuing",
GLOBAL_VAR(delayed_insert_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(DELAYED_LIMIT), BLOCK_SIZE(1));
static Sys_var_ulong Sys_delayed_insert_timeout(
"delayed_insert_timeout",
"How long a INSERT DELAYED thread should wait for INSERT statements "
"before terminating",
GLOBAL_VAR(delayed_insert_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, LONG_TIMEOUT), DEFAULT(DELAYED_WAIT_TIMEOUT),
BLOCK_SIZE(1));
static Sys_var_ulong Sys_delayed_queue_size(
"delayed_queue_size",
"What size queue (in rows) should be allocated for handling INSERT "
"DELAYED. If the queue becomes full, any client that does INSERT "
"DELAYED will wait until there is room in the queue again",
GLOBAL_VAR(delayed_queue_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(DELAYED_QUEUE_SIZE), BLOCK_SIZE(1));
#ifdef HAVE_EVENT_SCHEDULER
static const char *event_scheduler_names[]= { "OFF", "ON", "DISABLED", NullS };
static bool event_scheduler_check(sys_var *self, THD *thd, set_var *var)
{
/* DISABLED is only accepted on the command line */
if (var->save_result.ulonglong_value == Events::EVENTS_DISABLED)
return true;
/*
If the scheduler was disabled because there are no/bad
system tables, produce a more meaningful error message
than ER_OPTION_PREVENTS_STATEMENT
*/
if (Events::check_if_system_tables_error())
return true;
if (Events::opt_event_scheduler == Events::EVENTS_DISABLED)
{
my_error(ER_OPTION_PREVENTS_STATEMENT, MYF(0),
"--event-scheduler=DISABLED or --skip-grant-tables");
return true;
}
return false;
}
static bool event_scheduler_update(sys_var *self, THD *thd, enum_var_type type)
{
mysql_mutex_unlock(&LOCK_global_system_variables);
/*
Events::start() is heavyweight. In particular it creates a new THD,
which takes LOCK_global_system_variables internally.
Thus we have to release it here.
We need to re-take it before returning, though.
And we need to take it *without* holding Events::LOCK_event_metadata.
*/
bool ret= Events::opt_event_scheduler == Events::EVENTS_ON
? Events::start()
: Events::stop();
mysql_mutex_unlock(&Events::LOCK_event_metadata);
mysql_mutex_lock(&LOCK_global_system_variables);
mysql_mutex_lock(&Events::LOCK_event_metadata);
if (ret)
my_error(ER_EVENT_SET_VAR_ERROR, MYF(0));
return ret;
}
static PolyLock_mutex PLock_event_metadata(&Events::LOCK_event_metadata);
static Sys_var_enum Sys_event_scheduler(
"event_scheduler", "Enable the event scheduler. Possible values are "
"ON, OFF, and DISABLED (keep the event scheduler completely "
"deactivated, it cannot be activated run-time)",
GLOBAL_VAR(Events::opt_event_scheduler), CMD_LINE(OPT_ARG),
event_scheduler_names, DEFAULT(Events::EVENTS_OFF),
&PLock_event_metadata, NOT_IN_BINLOG,
ON_CHECK(event_scheduler_check), ON_UPDATE(event_scheduler_update));
#endif
static Sys_var_ulong Sys_expire_logs_days(
"expire_logs_days",
"If non-zero, binary logs will be purged after expire_logs_days "
"days; possible purges happen at startup and at binary log rotation",
GLOBAL_VAR(expire_logs_days),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 99), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_mybool Sys_flush(
"flush", "Flush MyISAM tables to disk between SQL commands",
GLOBAL_VAR(myisam_flush),
CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static Sys_var_ulong Sys_flush_time(
"flush_time",
"A dedicated thread is created to flush all tables at the "
"given interval",
GLOBAL_VAR(flush_time),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, LONG_TIMEOUT),
DEFAULT(FLUSH_TIME), BLOCK_SIZE(1));
static bool check_ftb_syntax(sys_var *self, THD *thd, set_var *var)
{
return ft_boolean_check_syntax_string((uchar*)
(var->save_result.string_value.str));
}
static bool query_cache_flush(sys_var *self, THD *thd, enum_var_type type)
{
#ifdef HAVE_QUERY_CACHE
query_cache.flush();
#endif /* HAVE_QUERY_CACHE */
return false;
}
/// @todo make SESSION_VAR (usability enhancement and a fix for a race condition)
static Sys_var_charptr Sys_ft_boolean_syntax(
"ft_boolean_syntax", "List of operators for "
"MATCH ... AGAINST ( ... IN BOOLEAN MODE)",
GLOBAL_VAR(ft_boolean_syntax),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(DEFAULT_FTB_SYNTAX), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(check_ftb_syntax), ON_UPDATE(query_cache_flush));
static Sys_var_ulong Sys_ft_max_word_len(
"ft_max_word_len",
"The maximum length of the word to be included in a FULLTEXT index. "
"Note: FULLTEXT indexes must be rebuilt after changing this variable",
READ_ONLY GLOBAL_VAR(ft_max_word_len), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(10, HA_FT_MAXCHARLEN), DEFAULT(HA_FT_MAXCHARLEN),
BLOCK_SIZE(1));
static Sys_var_ulong Sys_ft_min_word_len(
"ft_min_word_len",
"The minimum length of the word to be included in a FULLTEXT index. "
"Note: FULLTEXT indexes must be rebuilt after changing this variable",
READ_ONLY GLOBAL_VAR(ft_min_word_len), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, HA_FT_MAXCHARLEN), DEFAULT(4), BLOCK_SIZE(1));
/// @todo make it an updatable SESSION_VAR
static Sys_var_ulong Sys_ft_query_expansion_limit(
"ft_query_expansion_limit",
"Number of best matches to use for query expansion",
READ_ONLY GLOBAL_VAR(ft_query_expansion_limit),
CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 1000), DEFAULT(20), BLOCK_SIZE(1));
static Sys_var_charptr Sys_ft_stopword_file(
"ft_stopword_file",
"Use stopwords from this file instead of built-in list",
READ_ONLY GLOBAL_VAR(ft_stopword_file), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_mybool Sys_ignore_builtin_innodb(
"ignore_builtin_innodb",
"Disable initialization of builtin InnoDB plugin",
READ_ONLY GLOBAL_VAR(opt_ignore_builtin_innodb),
CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static bool check_init_string(sys_var *self, THD *thd, set_var *var)
{
if (var->save_result.string_value.str == 0)
{
var->save_result.string_value.str= const_cast<char*>("");
var->save_result.string_value.length= 0;
}
return false;
}
static PolyLock_rwlock PLock_sys_init_connect(&LOCK_sys_init_connect);
static Sys_var_lexstring Sys_init_connect(
"init_connect", "Command(s) that are executed for each "
"new connection", GLOBAL_VAR(opt_init_connect),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(""), &PLock_sys_init_connect, NOT_IN_BINLOG,
ON_CHECK(check_init_string));
static Sys_var_charptr Sys_init_file(
"init_file", "Read SQL commands from this file at startup",
READ_ONLY GLOBAL_VAR(opt_init_file),
IF_DISABLE_GRANT_OPTIONS(NO_CMD_LINE, CMD_LINE(REQUIRED_ARG)),
IN_FS_CHARSET, DEFAULT(0));
static PolyLock_rwlock PLock_sys_init_slave(&LOCK_sys_init_slave);
static Sys_var_lexstring Sys_init_slave(
"init_slave", "Command(s) that are executed by a slave server "
"each time the SQL thread starts", GLOBAL_VAR(opt_init_slave),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(""), &PLock_sys_init_slave,
NOT_IN_BINLOG, ON_CHECK(check_init_string));
static Sys_var_ulong Sys_interactive_timeout(
"interactive_timeout",
"The number of seconds the server waits for activity on an interactive "
"connection before closing it",
SESSION_VAR(net_interactive_timeout),
CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, LONG_TIMEOUT), DEFAULT(NET_WAIT_TIMEOUT), BLOCK_SIZE(1));
static Sys_var_ulong Sys_join_buffer_size(
"join_buffer_size",
"The size of the buffer that is used for full joins",
SESSION_VAR(join_buff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(128, ULONG_MAX), DEFAULT(128*1024), BLOCK_SIZE(128));
static Sys_var_keycache Sys_key_buffer_size(
"key_buffer_size", "The size of the buffer used for "
"index blocks for MyISAM tables. Increase this to get better index "
"handling (for all reads and multiple writes) to as much as you can "
"afford",
KEYCACHE_VAR(param_buff_size),
CMD_LINE(REQUIRED_ARG, OPT_KEY_BUFFER_SIZE),
VALID_RANGE(0, SIZE_T_MAX), DEFAULT(KEY_CACHE_SIZE),
BLOCK_SIZE(IO_SIZE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_buffer_size));
static Sys_var_keycache Sys_key_cache_block_size(
"key_cache_block_size", "The default size of key cache blocks",
KEYCACHE_VAR(param_block_size),
CMD_LINE(REQUIRED_ARG, OPT_KEY_CACHE_BLOCK_SIZE),
VALID_RANGE(512, 1024*16), DEFAULT(KEY_CACHE_BLOCK_SIZE),
BLOCK_SIZE(512), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_keycache_param));
static Sys_var_keycache Sys_key_cache_division_limit(
"key_cache_division_limit",
"The minimum percentage of warm blocks in key cache",
KEYCACHE_VAR(param_division_limit),
CMD_LINE(REQUIRED_ARG, OPT_KEY_CACHE_DIVISION_LIMIT),
VALID_RANGE(1, 100), DEFAULT(100),
BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_keycache_param));
static Sys_var_keycache Sys_key_cache_age_threshold(
"key_cache_age_threshold", "This characterizes the number of "
"hits a hot block has to be untouched until it is considered aged "
"enough to be downgraded to a warm block. This specifies the "
"percentage ratio of that number of hits to the total number of "
"blocks in key cache",
KEYCACHE_VAR(param_age_threshold),
CMD_LINE(REQUIRED_ARG, OPT_KEY_CACHE_AGE_THRESHOLD),
VALID_RANGE(100, ULONG_MAX), DEFAULT(300),
BLOCK_SIZE(100), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_keycache_param));
static Sys_var_mybool Sys_large_files_support(
"large_files_support",
"Whether mysqld was compiled with options for large file support",
READ_ONLY GLOBAL_VAR(opt_large_files),
NO_CMD_LINE, DEFAULT(sizeof(my_off_t) > 4));
static Sys_var_uint Sys_large_page_size(
"large_page_size",
"If large page support is enabled, this shows the size of memory pages",
READ_ONLY GLOBAL_VAR(opt_large_page_size), NO_CMD_LINE,
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_mybool Sys_large_pages(
"large_pages", "Enable support for large pages",
READ_ONLY GLOBAL_VAR(opt_large_files),
IF_WIN(NO_CMD_LINE, CMD_LINE(OPT_ARG)), DEFAULT(FALSE));
static Sys_var_charptr Sys_language(
"lc_messages_dir", "Directory where error messages are",
READ_ONLY GLOBAL_VAR(lc_messages_dir_ptr), CMD_LINE(REQUIRED_ARG, 'L'),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_mybool Sys_local_infile(
"local_infile", "Enable LOAD DATA LOCAL INFILE",
GLOBAL_VAR(opt_local_infile), CMD_LINE(OPT_ARG), DEFAULT(TRUE));
#ifdef HAVE_MLOCKALL
static Sys_var_mybool Sys_locked_in_memory(
"locked_in_memory",
"Whether mysqld was locked in memory with --memlock",
READ_ONLY GLOBAL_VAR(locked_in_memory), NO_CMD_LINE, DEFAULT(FALSE));
#endif
/* this says NO_CMD_LINE, as command-line option takes a string, not a bool */
static Sys_var_mybool Sys_log_bin(
"log_bin", "Whether the binary log is enabled",
READ_ONLY GLOBAL_VAR(opt_bin_log), NO_CMD_LINE, DEFAULT(FALSE));
static Sys_var_mybool Sys_trust_function_creators(
"log_bin_trust_function_creators",
"If set to FALSE (the default), then when --log-bin is used, creation "
"of a stored function (or trigger) is allowed only to users having the "
"SUPER privilege and only if this stored function (trigger) may not "
"break binary logging. Note that if ALL connections to this server "
"ALWAYS use row-based binary logging, the security issues do not "
"exist and the binary logging cannot break, so you can safely set "
"this to TRUE",
GLOBAL_VAR(trust_function_creators),
CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static Sys_var_charptr Sys_log_error(
"log_error", "Error log file",
READ_ONLY GLOBAL_VAR(log_error_file_ptr), CMD_LINE(OPT_ARG),
IN_FS_CHARSET, DEFAULT(disabled_my_option));
static Sys_var_mybool Sys_log_queries_not_using_indexes(
"log_queries_not_using_indexes",
"Log queries that are executed without benefit of any index to the "
"slow log if it is open",
GLOBAL_VAR(opt_log_queries_not_using_indexes),
CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static Sys_var_ulong Sys_log_warnings(
"log_warnings",
"Log some not critical warnings to the log file",
SESSION_VAR(log_warnings),
CMD_LINE(OPT_ARG, 'W'),
VALID_RANGE(0, ULONG_MAX), DEFAULT(1), BLOCK_SIZE(1));
static bool update_cached_long_query_time(sys_var *self, THD *thd,
enum_var_type type)
{
if (type == OPT_SESSION)
thd->variables.long_query_time=
thd->variables.long_query_time_double * 1e6;
else
global_system_variables.long_query_time=
global_system_variables.long_query_time_double * 1e6;
return false;
}
static Sys_var_double Sys_long_query_time(
"long_query_time",
"Log all queries that have taken more than long_query_time seconds "
"to execute to file. The argument will be treated as a decimal value "
"with microsecond precision",
SESSION_VAR(long_query_time_double),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, LONG_TIMEOUT), DEFAULT(10),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_cached_long_query_time));
static bool fix_low_prio_updates(sys_var *self, THD *thd, enum_var_type type)
{
if (type == OPT_SESSION)
thd->update_lock_default= (thd->variables.low_priority_updates ?
TL_WRITE_LOW_PRIORITY : TL_WRITE);
else
thr_upgraded_concurrent_insert_lock=
(global_system_variables.low_priority_updates ?
TL_WRITE_LOW_PRIORITY : TL_WRITE);
return false;
}
static Sys_var_mybool Sys_low_priority_updates(
"low_priority_updates",
"INSERT/DELETE/UPDATE has lower priority than selects",
SESSION_VAR(low_priority_updates),
CMD_LINE(OPT_ARG),
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_low_prio_updates));
#ifndef TO_BE_DELETED /* Alias for the low_priority_updates */
static Sys_var_mybool Sys_sql_low_priority_updates(
"sql_low_priority_updates",
"INSERT/DELETE/UPDATE has lower priority than selects",
SESSION_VAR(low_priority_updates), NO_CMD_LINE,
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_low_prio_updates));
#endif
static Sys_var_mybool Sys_lower_case_file_system(
"lower_case_file_system",
"Case sensitivity of file names on the file system where the "
"data directory is located",
READ_ONLY GLOBAL_VAR(lower_case_file_system), NO_CMD_LINE,
DEFAULT(FALSE));
static Sys_var_uint Sys_lower_case_table_names(
"lower_case_table_names",
"If set to 1 table names are stored in lowercase on disk and table "
"names will be case-insensitive. Should be set to 2 if you are using "
"a case insensitive file system",
READ_ONLY GLOBAL_VAR(lower_case_table_names),
CMD_LINE(OPT_ARG, OPT_LOWER_CASE_TABLE_NAMES),
VALID_RANGE(0, 2),
#ifdef FN_NO_CASE_SENSE
DEFAULT(1),
#else
DEFAULT(0),
#endif
BLOCK_SIZE(1));
static bool session_readonly(sys_var *self, THD *thd, set_var *var)
{
if (var->type == OPT_GLOBAL)
return false;
my_error(ER_VARIABLE_IS_READONLY, MYF(0), "SESSION",
self->name.str, "GLOBAL");
return true;
}
static Sys_var_ulong Sys_max_allowed_packet(
"max_allowed_packet",
"Max packet length to send to or receive from the server",
SESSION_VAR(max_allowed_packet), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, 1024*1024*1024), DEFAULT(1024*1024),
BLOCK_SIZE(1024), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(session_readonly));
static Sys_var_ulonglong Sys_max_binlog_cache_size(
"max_binlog_cache_size",
"Can be used to restrict the total size used to cache a "
"multi-transaction query",
GLOBAL_VAR(max_binlog_cache_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(IO_SIZE, ULONGLONG_MAX),
DEFAULT((ULONGLONG_MAX/IO_SIZE)*IO_SIZE),
BLOCK_SIZE(IO_SIZE));
static bool fix_max_binlog_size(sys_var *self, THD *thd, enum_var_type type)
{
mysql_bin_log.set_max_size(max_binlog_size);
#ifdef HAVE_REPLICATION
if (!max_relay_log_size)
active_mi->rli.relay_log.set_max_size(max_binlog_size);
#endif
return false;
}
static Sys_var_ulong Sys_max_binlog_size(
"max_binlog_size",
"Binary log will be rotated automatically when the size exceeds this "
"value. Will also apply to relay logs if max_relay_log_size is 0",
GLOBAL_VAR(max_binlog_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(IO_SIZE, 1024*1024L*1024L), DEFAULT(1024*1024L*1024L),
BLOCK_SIZE(IO_SIZE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_max_binlog_size));
static bool fix_max_connections(sys_var *self, THD *thd, enum_var_type type)
{
#ifndef EMBEDDED_LIBRARY
resize_thr_alarm(max_connections +
global_system_variables.max_insert_delayed_threads + 10);
#endif
return false;
}
// Default max_connections of 151 is larger than Apache's default max
// children, to avoid "too many connections" error in a common setup
static Sys_var_ulong Sys_max_connections(
"max_connections", "The number of simultaneous clients allowed",
GLOBAL_VAR(max_connections), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 100000), DEFAULT(151), BLOCK_SIZE(1), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(fix_max_connections));
static Sys_var_ulong Sys_max_connect_errors(
"max_connect_errors",
"If there is more than this number of interrupted connections from "
"a host this host will be blocked from further connections",
GLOBAL_VAR(max_connect_errors), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(MAX_CONNECT_ERRORS),
BLOCK_SIZE(1));
static bool check_max_delayed_threads(sys_var *self, THD *thd, set_var *var)
{
return var->type != OPT_GLOBAL &&
var->save_result.ulonglong_value != 0 &&
var->save_result.ulonglong_value !=
global_system_variables.max_insert_delayed_threads;
}
// Alias for max_delayed_threads
static Sys_var_ulong Sys_max_insert_delayed_threads(
"max_insert_delayed_threads",
"Don't start more than this number of threads to handle INSERT "
"DELAYED statements. If set to zero INSERT DELAYED will be not used",
SESSION_VAR(max_insert_delayed_threads),
NO_CMD_LINE, VALID_RANGE(0, 16384), DEFAULT(20),
BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_max_delayed_threads), ON_UPDATE(fix_max_connections));
static Sys_var_ulong Sys_max_delayed_threads(
"max_delayed_threads",
"Don't start more than this number of threads to handle INSERT "
"DELAYED statements. If set to zero INSERT DELAYED will be not used",
SESSION_VAR(max_insert_delayed_threads),
CMD_LINE(REQUIRED_ARG), VALID_RANGE(0, 16384), DEFAULT(20),
BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_max_delayed_threads), ON_UPDATE(fix_max_connections));
static Sys_var_ulong Sys_max_error_count(
"max_error_count",
"Max number of errors/warnings to store for a statement",
SESSION_VAR(max_error_count), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 65535), DEFAULT(DEFAULT_ERROR_COUNT), BLOCK_SIZE(1));
static Sys_var_ulonglong Sys_max_heap_table_size(
"max_heap_table_size",
"Don't allow creation of heap tables bigger than this",
SESSION_VAR(max_heap_table_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(16384, (ulonglong)~(intptr)0), DEFAULT(16*1024*1024),
BLOCK_SIZE(1024));
static Sys_var_ulong Sys_pseudo_thread_id(
"pseudo_thread_id",
"This variable is for internal server use",
SESSION_ONLY(pseudo_thread_id),
NO_CMD_LINE, VALID_RANGE(0, ULONG_MAX), DEFAULT(0),
BLOCK_SIZE(1), NO_MUTEX_GUARD, IN_BINLOG,
ON_CHECK(check_has_super));
static bool fix_max_join_size(sys_var *self, THD *thd, enum_var_type type)
{
SV *sv= type == OPT_GLOBAL ? &global_system_variables : &thd->variables;
if (sv->max_join_size == HA_POS_ERROR)
sv->option_bits|= OPTION_BIG_SELECTS;
else
sv->option_bits&= ~OPTION_BIG_SELECTS;
return false;
}
static Sys_var_harows Sys_max_join_size(
"max_join_size",
"Joins that are probably going to read more than max_join_size "
"records return an error",
SESSION_VAR(max_join_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, HA_POS_ERROR), DEFAULT(HA_POS_ERROR), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_max_join_size));
static Sys_var_ulong Sys_max_seeks_for_key(
"max_seeks_for_key",
"Limit assumed max number of seeks when looking up rows based on a key",
SESSION_VAR(max_seeks_for_key), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(ULONG_MAX), BLOCK_SIZE(1));
static Sys_var_ulong Sys_max_length_for_sort_data(
"max_length_for_sort_data",
"Max number of bytes in sorted records",
SESSION_VAR(max_length_for_sort_data), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(4, 8192*1024L), DEFAULT(1024), BLOCK_SIZE(1));
static Sys_var_harows Sys_sql_max_join_size(
"sql_max_join_size", "Alias for max_join_size",
SESSION_VAR(max_join_size), NO_CMD_LINE,
VALID_RANGE(1, HA_POS_ERROR), DEFAULT(HA_POS_ERROR), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_max_join_size), DEPRECATED(70000, 0));
static PolyLock_mutex PLock_prepared_stmt_count(&LOCK_prepared_stmt_count);
static Sys_var_ulong Sys_max_prepared_stmt_count(
"max_prepared_stmt_count",
"Maximum number of prepared statements in the server",
GLOBAL_VAR(max_prepared_stmt_count), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 1024*1024), DEFAULT(16382), BLOCK_SIZE(1),
&PLock_prepared_stmt_count);
static bool fix_max_relay_log_size(sys_var *self, THD *thd, enum_var_type type)
{
#ifdef HAVE_REPLICATION
active_mi->rli.relay_log.set_max_size(max_relay_log_size ?
max_relay_log_size: max_binlog_size);
#endif
return false;
}
static Sys_var_ulong Sys_max_relay_log_size(
"max_relay_log_size",
"If non-zero: relay log will be rotated automatically when the "
"size exceeds this value; if zero: when the size "
"exceeds max_binlog_size",
GLOBAL_VAR(max_relay_log_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 1024L*1024*1024), DEFAULT(0), BLOCK_SIZE(IO_SIZE),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_max_relay_log_size));
static Sys_var_ulong Sys_max_sort_length(
"max_sort_length",
"The number of bytes to use when sorting BLOB or TEXT values (only "
"the first max_sort_length bytes of each value are used; the rest "
"are ignored)",
SESSION_VAR(max_sort_length), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(4, 8192*1024L), DEFAULT(1024), BLOCK_SIZE(1));
static Sys_var_ulong Sys_max_sp_recursion_depth(
"max_sp_recursion_depth",
"Maximum stored procedure recursion depth",
SESSION_VAR(max_sp_recursion_depth), CMD_LINE(OPT_ARG),
VALID_RANGE(0, 255), DEFAULT(0), BLOCK_SIZE(1));
// non-standard session_value_ptr() here
static Sys_var_max_user_conn Sys_max_user_connections(
"max_user_connections",
"The maximum number of active connections for a single user "
"(0 = no limit)",
SESSION_VAR(max_user_connections), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(session_readonly));
static Sys_var_ulong Sys_max_tmp_tables(
"max_tmp_tables",
"Maximum number of temporary tables a client can keep open at a time",
SESSION_VAR(max_tmp_tables), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(32), BLOCK_SIZE(1));
static Sys_var_ulong Sys_max_write_lock_count(
"max_write_lock_count",
"After this many write locks, allow some read locks to run in between",
GLOBAL_VAR(max_write_lock_count), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(ULONG_MAX), BLOCK_SIZE(1));
static Sys_var_ulong Sys_min_examined_row_limit(
"min_examined_row_limit",
"Don't write queries to slow log that examine fewer rows "
"than that",
SESSION_VAR(min_examined_row_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(0), BLOCK_SIZE(1));
#ifdef _WIN32
static Sys_var_mybool Sys_named_pipe(
"named_pipe", "Enable the named pipe (NT)",
READ_ONLY GLOBAL_VAR(opt_enable_named_pipe), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
#endif
static Sys_var_ulong Sys_net_buffer_length(
"net_buffer_length",
"Buffer length for TCP/IP and socket communication",
SESSION_VAR(net_buffer_length), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, 1024*1024), DEFAULT(16384), BLOCK_SIZE(1024),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(session_readonly));
static bool fix_net_read_timeout(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
my_net_set_read_timeout(&thd->net, thd->variables.net_read_timeout);
return false;
}
static Sys_var_ulong Sys_net_read_timeout(
"net_read_timeout",
"Number of seconds to wait for more data from a connection before "
"aborting the read",
SESSION_VAR(net_read_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, LONG_TIMEOUT), DEFAULT(NET_READ_TIMEOUT), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_net_read_timeout));
static bool fix_net_write_timeout(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
my_net_set_write_timeout(&thd->net, thd->variables.net_write_timeout);
return false;
}
static Sys_var_ulong Sys_net_write_timeout(
"net_write_timeout",
"Number of seconds to wait for a block to be written to a connection "
"before aborting the write",
SESSION_VAR(net_write_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, LONG_TIMEOUT), DEFAULT(NET_WRITE_TIMEOUT), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_net_write_timeout));
static bool fix_net_retry_count(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
thd->net.retry_count=thd->variables.net_retry_count;
return false;
}
static Sys_var_ulong Sys_net_retry_count(
"net_retry_count",
"If a read on a communication port is interrupted, retry this "
"many times before giving up",
SESSION_VAR(net_retry_count), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(MYSQLD_NET_RETRY_COUNT),
BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_net_retry_count));
static Sys_var_mybool Sys_new_mode(
"new", "Use very new possible \"unsafe\" functions",
SESSION_VAR(new_mode), CMD_LINE(OPT_ARG, 'n'), DEFAULT(FALSE));
static Sys_var_mybool Sys_old_mode(
"old", "Use compatible behavior",
READ_ONLY GLOBAL_VAR(old_mode), CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static Sys_var_mybool Sys_old_alter_table(
"old_alter_table", "Use old, non-optimized alter table",
SESSION_VAR(old_alter_table), CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static bool check_old_passwords(sys_var *self, THD *thd, set_var *var)
{
return mysql_user_table_is_in_short_password_format;
}
static Sys_var_mybool Sys_old_passwords(
"old_passwords",
"Use old password encryption method (needed for 4.0 and older clients)",
SESSION_VAR(old_passwords), CMD_LINE(OPT_ARG), DEFAULT(FALSE),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_old_passwords));
static Sys_var_ulong Sys_open_files_limit(
"open_files_limit",
"If this is not 0, then mysqld will use this value to reserve file "
"descriptors to use with setrlimit(). If this value is 0 then mysqld "
"will reserve max_connections*5 or max_connections + table_cache*2 "
"(whichever is larger) number of file descriptors",
READ_ONLY GLOBAL_VAR(open_files_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, OS_FILE_LIMIT), DEFAULT(0), BLOCK_SIZE(1));
/// @todo change to enum
static Sys_var_ulong Sys_optimizer_prune_level(
"optimizer_prune_level",
"Controls the heuristic(s) applied during query optimization to prune "
"less-promising partial plans from the optimizer search space. "
"Meaning: 0 - do not apply any heuristic, thus perform exhaustive "
"search; 1 - prune plans based on number of retrieved rows",
SESSION_VAR(optimizer_prune_level), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 1), DEFAULT(1), BLOCK_SIZE(1));
static Sys_var_ulong Sys_optimizer_search_depth(
"optimizer_search_depth",
"Maximum depth of search performed by the query optimizer. Values "
"larger than the number of relations in a query result in better "
"query plans, but take longer to compile a query. Values smaller "
"than the number of tables in a relation result in faster "
"optimization, but may produce very bad query plans. If set to 0, "
"the system will automatically pick a reasonable value; if set to "
"63, the optimizer will switch to the original find_best search"
"(used for testing/comparison)",
SESSION_VAR(optimizer_search_depth), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, MAX_TABLES+2), DEFAULT(MAX_TABLES+1), BLOCK_SIZE(1));
static const char *optimizer_switch_names[]=
{
"index_merge", "index_merge_union", "index_merge_sort_union",
"index_merge_intersection", "engine_condition_pushdown",
"default", NullS
};
/** propagates changes to @@engine_condition_pushdown */
static bool fix_optimizer_switch(sys_var *self, THD *thd,
enum_var_type type)
{
SV *sv= (type == OPT_GLOBAL) ? &global_system_variables : &thd->variables;
sv->engine_condition_pushdown=
test(sv->optimizer_switch & OPTIMIZER_SWITCH_ENGINE_CONDITION_PUSHDOWN);
return false;
}
static Sys_var_flagset Sys_optimizer_switch(
"optimizer_switch",
"optimizer_switch=option=val[,option=val...], where option is one of "
"{index_merge, index_merge_union, index_merge_sort_union, "
"index_merge_intersection, engine_condition_pushdown}"
" and val is one of {on, off, default}",
SESSION_VAR(optimizer_switch), CMD_LINE(REQUIRED_ARG),
optimizer_switch_names, DEFAULT(OPTIMIZER_SWITCH_DEFAULT),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(NULL),
ON_UPDATE(fix_optimizer_switch));
static Sys_var_charptr Sys_pid_file(
"pid_file", "Pid file used by safe_mysqld",
READ_ONLY GLOBAL_VAR(pidfile_name_ptr), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_plugin_dir(
"plugin_dir", "Directory for plugins",
READ_ONLY GLOBAL_VAR(opt_plugin_dir_ptr), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_uint Sys_port(
"port",
"Port number to use for connection or 0 to default to, "
"my.cnf, $MYSQL_TCP_PORT, "
#if MYSQL_PORT_DEFAULT == 0
"/etc/services, "
#endif
"built-in default (" STRINGIFY_ARG(MYSQL_PORT) "), whatever comes first",
READ_ONLY GLOBAL_VAR(mysqld_port), CMD_LINE(REQUIRED_ARG, 'P'),
VALID_RANGE(0, UINT_MAX32), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_ulong Sys_preload_buff_size(
"preload_buffer_size",
"The size of the buffer that is allocated when preloading indexes",
SESSION_VAR(preload_buff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, 1024*1024*1024), DEFAULT(32768), BLOCK_SIZE(1));
static Sys_var_uint Sys_protocol_version(
"protocol_version",
"The version of the client/server protocol used by the MySQL server",
READ_ONLY GLOBAL_VAR(protocol_version), NO_CMD_LINE,
VALID_RANGE(0, ~0), DEFAULT(PROTOCOL_VERSION), BLOCK_SIZE(1));
static Sys_var_ulong Sys_read_buff_size(
"read_buffer_size",
"Each thread that does a sequential scan allocates a buffer of "
"this size for each table it scans. If you do many sequential scans, "
"you may want to increase this value",
SESSION_VAR(read_buff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(IO_SIZE*2, INT_MAX32), DEFAULT(128*1024),
BLOCK_SIZE(IO_SIZE));
static my_bool read_only;
static bool check_read_only(sys_var *self, THD *thd, set_var *var)
{
/* Prevent self dead-lock */
if (thd->locked_tables || thd->active_transaction())
{
my_error(ER_LOCK_OR_ACTIVE_TRANSACTION, MYF(0));
return true;
}
return false;
}
static bool fix_read_only(sys_var *self, THD *thd, enum_var_type type)
{
bool result= true;
my_bool new_read_only= read_only; // make a copy before releasing a mutex
DBUG_ENTER("sys_var_opt_readonly::update");
if (read_only == FALSE || read_only == opt_readonly)
{
opt_readonly= read_only;
DBUG_RETURN(false);
}
if (check_read_only(self, thd, 0)) // just in case
goto end;
if (thd->global_read_lock)
{
/*
This connection already holds the global read lock.
This can be the case with:
- FLUSH TABLES WITH READ LOCK
- SET GLOBAL READ_ONLY = 1
*/
opt_readonly= read_only;
DBUG_RETURN(false);
}
/*
Perform a 'FLUSH TABLES WITH READ LOCK'.
This is a 3 step process:
- [1] lock_global_read_lock()
- [2] close_cached_tables()
- [3] make_global_read_lock_block_commit()
[1] prevents new connections from obtaining tables locked for write.
[2] waits until all existing connections close their tables.
[3] prevents transactions from being committed.
*/
read_only= opt_readonly;
mysql_mutex_unlock(&LOCK_global_system_variables);
if (lock_global_read_lock(thd))
goto end_with_mutex_unlock;
/*
This call will be blocked by any connection holding a READ or WRITE lock.
Ideally, we want to wait only for pending WRITE locks, but since:
con 1> LOCK TABLE T FOR READ;
con 2> LOCK TABLE T FOR WRITE; (blocked by con 1)
con 3> SET GLOBAL READ ONLY=1; (blocked by con 2)
can cause to wait on a read lock, it's required for the client application
to unlock everything, and acceptable for the server to wait on all locks.
*/
if ((result= close_cached_tables(thd, NULL, FALSE, TRUE, TRUE)))
goto end_with_read_lock;
if ((result= make_global_read_lock_block_commit(thd)))
goto end_with_read_lock;
/* Change the opt_readonly system variable, safe because the lock is held */
opt_readonly= new_read_only;
result= false;
end_with_read_lock:
/* Release the lock */
unlock_global_read_lock(thd);
end_with_mutex_unlock:
mysql_mutex_lock(&LOCK_global_system_variables);
end:
read_only= opt_readonly;
DBUG_RETURN(result);
}
static Sys_var_mybool Sys_readonly(
"read_only",
"Make all non-temporary tables read-only, with the exception for "
"replication (slave) threads and users with the SUPER privilege",
GLOBAL_VAR(read_only), CMD_LINE(OPT_ARG), DEFAULT(FALSE),
NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_read_only), ON_UPDATE(fix_read_only));
// Small lower limit to be able to test MRR
static Sys_var_ulong Sys_read_rnd_buff_size(
"read_rnd_buffer_size",
"When reading rows in sorted order after a sort, the rows are read "
"through this buffer to avoid a disk seeks. If not set, then it's "
"set to the value of record_buffer",
SESSION_VAR(read_rnd_buff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, INT_MAX32), DEFAULT(256*1024), BLOCK_SIZE(1));
static Sys_var_ulong Sys_div_precincrement(
"div_precision_increment", "Precision of the result of '/' "
"operator will be increased on that value",
SESSION_VAR(div_precincrement), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, DECIMAL_MAX_SCALE), DEFAULT(4), BLOCK_SIZE(1));
static Sys_var_ulong Sys_rpl_recovery_rank(
"rpl_recovery_rank", "Unused, will be removed",
GLOBAL_VAR(rpl_recovery_rank), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(0), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(0),
DEPRECATED(70000, 0));
static Sys_var_ulong Sys_range_alloc_block_size(
"range_alloc_block_size",
"Allocation block size for storing ranges during optimization",
SESSION_VAR(range_alloc_block_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(RANGE_ALLOC_BLOCK_SIZE, ULONG_MAX),
DEFAULT(RANGE_ALLOC_BLOCK_SIZE), BLOCK_SIZE(1024));
static Sys_var_ulong Sys_multi_range_count(
"multi_range_count", "Number of key ranges to request at once",
SESSION_VAR(multi_range_count), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, ULONG_MAX), DEFAULT(256), BLOCK_SIZE(1));
static bool fix_thd_mem_root(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
reset_root_defaults(thd->mem_root,
thd->variables.query_alloc_block_size,
thd->variables.query_prealloc_size);
return false;
}
static Sys_var_ulong Sys_query_alloc_block_size(
"query_alloc_block_size",
"Allocation block size for query parsing and execution",
SESSION_VAR(query_alloc_block_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, ULONG_MAX), DEFAULT(QUERY_ALLOC_BLOCK_SIZE),
BLOCK_SIZE(1024), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_thd_mem_root));
static Sys_var_ulong Sys_query_prealloc_size(
"query_prealloc_size",
"Persistent buffer for query parsing and execution",
SESSION_VAR(query_prealloc_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(QUERY_ALLOC_PREALLOC_SIZE, ULONG_MAX),
DEFAULT(QUERY_ALLOC_PREALLOC_SIZE),
BLOCK_SIZE(1024), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_thd_mem_root));
#ifdef HAVE_SMEM
static Sys_var_mybool Sys_shared_memory(
"shared_memory", "Enable the shared memory",
READ_ONLY GLOBAL_VAR(opt_enable_shared_memory), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
static Sys_var_charptr Sys_shared_memory_base_name(
"shared_memory_base_name", "Base name of shared memory",
READ_ONLY GLOBAL_VAR(shared_memory_base_name), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
#endif
// this has to be NO_CMD_LINE as the command-line option has a different name
static Sys_var_mybool Sys_skip_external_locking(
"skip_external_locking", "Don't use system (external) locking",
READ_ONLY GLOBAL_VAR(my_disable_locking), NO_CMD_LINE, DEFAULT(TRUE));
static Sys_var_mybool Sys_skip_networking(
"skip_networking", "Don't allow connection with TCP/IP",
READ_ONLY GLOBAL_VAR(opt_disable_networking), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
static Sys_var_mybool Sys_skip_show_database(
"skip_show_database", "Don't allow 'SHOW DATABASE' commands",
READ_ONLY GLOBAL_VAR(opt_skip_show_db), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
static Sys_var_charptr Sys_socket(
"socket", "Socket file to use for connection",
READ_ONLY GLOBAL_VAR(mysqld_unix_port), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
#ifdef HAVE_THR_SETCONCURRENCY
static Sys_var_ulong Sys_thread_concurrency(
"thread_concurrency",
"Permits the application to give the threads system a hint for "
"the desired number of threads that should be run at the same time",
READ_ONLY GLOBAL_VAR(concurrency), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 512), DEFAULT(DEFAULT_CONCURRENCY), BLOCK_SIZE(1));
#endif
static Sys_var_ulong Sys_thread_stack(
"thread_stack", "The stack size for each thread",
READ_ONLY GLOBAL_VAR(my_thread_stack_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(128*1024, ULONG_MAX), DEFAULT(DEFAULT_THREAD_STACK),
BLOCK_SIZE(1024));
static Sys_var_charptr Sys_tmpdir(
"tmpdir", "Path for temporary files. Several paths may "
"be specified, separated by a "
#if defined(__WIN__) || defined(__NETWARE__)
"semicolon (;)"
#else
"colon (:)"
#endif
", in this case they are used in a round-robin fashion",
READ_ONLY GLOBAL_VAR(opt_mysql_tmpdir), CMD_LINE(REQUIRED_ARG, 't'),
IN_FS_CHARSET, DEFAULT(0));
static bool fix_trans_mem_root(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
reset_root_defaults(&thd->transaction.mem_root,
thd->variables.trans_alloc_block_size,
thd->variables.trans_prealloc_size);
return false;
}
static Sys_var_ulong Sys_trans_alloc_block_size(
"transaction_alloc_block_size",
"Allocation block size for transactions to be stored in binary log",
SESSION_VAR(trans_alloc_block_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, ULONG_MAX), DEFAULT(QUERY_ALLOC_BLOCK_SIZE),
BLOCK_SIZE(1024), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_trans_mem_root));
static Sys_var_ulong Sys_trans_prealloc_size(
"transaction_prealloc_size",
"Persistent buffer for transactions to be stored in binary log",
SESSION_VAR(trans_prealloc_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, ULONG_MAX), DEFAULT(TRANS_ALLOC_PREALLOC_SIZE),
BLOCK_SIZE(1024), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_trans_mem_root));
static const char *thread_handling_names[]=
{
"one-thread-per-connection", "no-threads",
#if HAVE_POOL_OF_THREADS == 1
"pool-of-threads",
#endif
0
};
static Sys_var_enum Sys_thread_handling(
"thread_handling",
"Define threads usage for handling queries, one of "
"one-thread-per-connection, no-threads"
#if HAVE_POOL_OF_THREADS == 1
", pool-of-threads"
#endif
, READ_ONLY GLOBAL_VAR(thread_handling), CMD_LINE(REQUIRED_ARG),
thread_handling_names, DEFAULT(0));
#ifdef HAVE_QUERY_CACHE
static bool fix_query_cache_size(sys_var *self, THD *thd, enum_var_type type)
{
ulong new_cache_size= query_cache.resize(query_cache_size);
/*
Note: query_cache_size is a global variable reflecting the
requested cache size. See also query_cache_size_arg
*/
if (query_cache_size != new_cache_size)
push_warning_printf(current_thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_WARN_QC_RESIZE, ER(ER_WARN_QC_RESIZE),
query_cache_size, new_cache_size);
query_cache_size= new_cache_size;
return false;
}
static Sys_var_ulong Sys_query_cache_size(
"query_cache_size",
"The memory allocated to store results from old queries",
GLOBAL_VAR(query_cache_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(0), BLOCK_SIZE(1024),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_query_cache_size));
static Sys_var_ulong Sys_query_cache_limit(
"query_cache_limit",
"Don't cache results that are bigger than this",
GLOBAL_VAR(query_cache.query_cache_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(1024*1024), BLOCK_SIZE(1));
static bool fix_qcache_min_res_unit(sys_var *self, THD *thd, enum_var_type type)
{
query_cache_min_res_unit=
query_cache.set_min_res_unit(query_cache_min_res_unit);
return false;
}
static Sys_var_ulong Sys_query_cache_min_res_unit(
"query_cache_min_res_unit",
"The minimum size for blocks allocated by the query cache",
GLOBAL_VAR(query_cache_min_res_unit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(QUERY_CACHE_MIN_RESULT_DATA_SIZE),
BLOCK_SIZE(1), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_qcache_min_res_unit));
static const char *query_cache_type_names[]= { "OFF", "ON", "DEMAND", 0 };
static bool check_query_cache_type(sys_var *self, THD *thd, set_var *var)
{
if (query_cache.is_disabled())
{
my_error(ER_QUERY_CACHE_DISABLED, MYF(0));
return true;
}
return false;
}
static Sys_var_enum Sys_query_cache_type(
"query_cache_type",
"OFF = Don't cache or retrieve results. ON = Cache all results "
"except SELECT SQL_NO_CACHE ... queries. DEMAND = Cache only "
"SELECT SQL_CACHE ... queries",
SESSION_VAR(query_cache_type), CMD_LINE(REQUIRED_ARG),
query_cache_type_names, DEFAULT(1), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_query_cache_type));
static Sys_var_mybool Sys_query_cache_wlock_invalidate(
"query_cache_wlock_invalidate",
"Invalidate queries in query cache on LOCK for write",
SESSION_VAR(query_cache_wlock_invalidate), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
#endif /* HAVE_QUERY_CACHE */
static Sys_var_mybool Sys_secure_auth(
"secure_auth",
"Disallow authentication for accounts that have old (pre-4.1) "
"passwords",
GLOBAL_VAR(opt_secure_auth), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
static Sys_var_charptr Sys_secure_file_priv(
"secure_file_priv",
"Limit LOAD DATA, SELECT ... OUTFILE, and LOAD_FILE() to files "
"within specified directory",
PREALLOCATED READ_ONLY GLOBAL_VAR(opt_secure_file_priv),
CMD_LINE(REQUIRED_ARG), IN_FS_CHARSET, DEFAULT(0));
static bool fix_server_id(sys_var *self, THD *thd, enum_var_type type)
{
server_id_supplied = 1;
thd->server_id= server_id;
return false;
}
static Sys_var_ulong Sys_server_id(
"server_id",
"Uniquely identifies the server instance in the community of "
"replication partners",
GLOBAL_VAR(server_id), CMD_LINE(REQUIRED_ARG, OPT_SERVER_ID),
VALID_RANGE(0, UINT_MAX32), DEFAULT(0), BLOCK_SIZE(1), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(fix_server_id));
static Sys_var_mybool Sys_slave_compressed_protocol(
"slave_compressed_protocol",
"Use compression on master/slave protocol",
GLOBAL_VAR(opt_slave_compressed_protocol), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
#ifdef HAVE_REPLICATION
static const char *slave_exec_mode_names[]= {"STRICT", "IDEMPOTENT", 0};
static Sys_var_enum Slave_exec_mode(
"slave_exec_mode",
"Modes for how replication events should be executed. Legal values "
"are STRICT (default) and IDEMPOTENT. In IDEMPOTENT mode, "
"replication will not stop for operations that are idempotent. "
"In STRICT mode, replication will stop on any unexpected difference "
"between the master and the slave",
GLOBAL_VAR(slave_exec_mode_options), CMD_LINE(REQUIRED_ARG),
slave_exec_mode_names, DEFAULT(SLAVE_EXEC_MODE_STRICT));
#endif
static Sys_var_ulong Sys_slow_launch_time(
"slow_launch_time",
"If creating the thread takes longer than this value (in seconds), "
"the Slow_launch_threads counter will be incremented",
GLOBAL_VAR(slow_launch_time), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, LONG_TIMEOUT), DEFAULT(2), BLOCK_SIZE(1));
static Sys_var_ulong Sys_sort_buffer(
"sort_buffer_size",
"Each thread that needs to do a sort allocates a buffer of this size",
SESSION_VAR(sortbuff_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(MIN_SORT_MEMORY, ULONG_MAX), DEFAULT(MAX_SORT_MEMORY),
BLOCK_SIZE(1));
export ulong expand_sql_mode(ulonglong sql_mode)
{
if (sql_mode & MODE_ANSI)
{
/*
Note that we dont set
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS | MODE_NO_FIELD_OPTIONS
to allow one to get full use of MySQL in this mode.
MODE_ONLY_FULL_GROUP_BY was removed from ANSI mode because it is
currently overly restrictive (see BUG#8510).
*/
sql_mode|= (MODE_REAL_AS_FLOAT | MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE);
}
if (sql_mode & MODE_ORACLE)
sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE |
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
if (sql_mode & MODE_MSSQL)
sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE |
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
MODE_NO_FIELD_OPTIONS);
if (sql_mode & MODE_POSTGRESQL)
sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE |
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
MODE_NO_FIELD_OPTIONS);
if (sql_mode & MODE_DB2)
sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE |
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
MODE_NO_FIELD_OPTIONS);
if (sql_mode & MODE_MAXDB)
sql_mode|= (MODE_PIPES_AS_CONCAT | MODE_ANSI_QUOTES |
MODE_IGNORE_SPACE |
MODE_NO_KEY_OPTIONS | MODE_NO_TABLE_OPTIONS |
MODE_NO_FIELD_OPTIONS | MODE_NO_AUTO_CREATE_USER);
if (sql_mode & MODE_MYSQL40)
sql_mode|= MODE_HIGH_NOT_PRECEDENCE;
if (sql_mode & MODE_MYSQL323)
sql_mode|= MODE_HIGH_NOT_PRECEDENCE;
if (sql_mode & MODE_TRADITIONAL)
sql_mode|= (MODE_STRICT_TRANS_TABLES | MODE_STRICT_ALL_TABLES |
MODE_NO_ZERO_IN_DATE | MODE_NO_ZERO_DATE |
MODE_ERROR_FOR_DIVISION_BY_ZERO | MODE_NO_AUTO_CREATE_USER |
MODE_NO_ENGINE_SUBSTITUTION);
return sql_mode;
}
static bool check_sql_mode(sys_var *self, THD *thd, set_var *var)
{
var->save_result.ulonglong_value=
expand_sql_mode(var->save_result.ulonglong_value);
return false;
}
static bool fix_sql_mode(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL)
{
/* Update thd->server_status */
if (thd->variables.sql_mode & MODE_NO_BACKSLASH_ESCAPES)
thd->server_status|= SERVER_STATUS_NO_BACKSLASH_ESCAPES;
else
thd->server_status&= ~SERVER_STATUS_NO_BACKSLASH_ESCAPES;
}
return false;
}
/*
WARNING: When adding new SQL modes don't forget to update the
tables definitions that stores it's value (ie: mysql.event, mysql.proc)
*/
static const char *sql_mode_names[]=
{
"REAL_AS_FLOAT", "PIPES_AS_CONCAT", "ANSI_QUOTES", "IGNORE_SPACE", ",",
"ONLY_FULL_GROUP_BY", "NO_UNSIGNED_SUBTRACTION", "NO_DIR_IN_CREATE",
"POSTGRESQL", "ORACLE", "MSSQL", "DB2", "MAXDB", "NO_KEY_OPTIONS",
"NO_TABLE_OPTIONS", "NO_FIELD_OPTIONS", "MYSQL323", "MYSQL40", "ANSI",
"NO_AUTO_VALUE_ON_ZERO", "NO_BACKSLASH_ESCAPES", "STRICT_TRANS_TABLES",
"STRICT_ALL_TABLES", "NO_ZERO_IN_DATE", "NO_ZERO_DATE",
"ALLOW_INVALID_DATES", "ERROR_FOR_DIVISION_BY_ZERO", "TRADITIONAL",
"NO_AUTO_CREATE_USER", "HIGH_NOT_PRECEDENCE", "NO_ENGINE_SUBSTITUTION",
"PAD_CHAR_TO_FULL_LENGTH",
0
};
export bool sql_mode_string_representation(THD *thd, ulong sql_mode,
LEX_STRING *ls)
{
set_to_string(thd, ls, sql_mode, sql_mode_names);
return ls->str == 0;
}
/*
sql_mode should *not* be IN_BINLOG: even though it is written to the binlog,
the slave ignores the MODE_NO_DIR_IN_CREATE variable, so slave's value
differs from master's (see log_event.cc: Query_log_event::do_apply_event()).
*/
static Sys_var_set Sys_sql_mode(
"sql_mode",
"Syntax: sql-mode=mode[,mode[,mode...]]. See the manual for the "
"complete list of valid sql modes",
SESSION_VAR(sql_mode), CMD_LINE(REQUIRED_ARG),
sql_mode_names, DEFAULT(0), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_sql_mode), ON_UPDATE(fix_sql_mode));
#ifdef HAVE_OPENSSL
#define SSL_OPT(X) CMD_LINE(REQUIRED_ARG,X)
#else
#define SSL_OPT(X) NO_CMD_LINE
#endif
static Sys_var_charptr Sys_ssl_ca(
"ssl_ca",
"CA file in PEM format (check OpenSSL docs, implies --ssl)",
READ_ONLY GLOBAL_VAR(opt_ssl_ca), SSL_OPT(OPT_SSL_CA),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_ssl_capath(
"ssl_capath",
"CA directory (check OpenSSL docs, implies --ssl)",
READ_ONLY GLOBAL_VAR(opt_ssl_capath), SSL_OPT(OPT_SSL_CAPATH),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_ssl_cert(
"ssl_cert", "X509 cert in PEM format (implies --ssl)",
READ_ONLY GLOBAL_VAR(opt_ssl_cert), SSL_OPT(OPT_SSL_CERT),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_ssl_cipher(
"ssl_cipher", "SSL cipher to use (implies --ssl)",
READ_ONLY GLOBAL_VAR(opt_ssl_cipher), SSL_OPT(OPT_SSL_CIPHER),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_ssl_key(
"ssl_key", "X509 key in PEM format (implies --ssl)",
READ_ONLY GLOBAL_VAR(opt_ssl_key), SSL_OPT(OPT_SSL_KEY),
IN_FS_CHARSET, DEFAULT(0));
// why ENUM and not BOOL ?
static const char *updatable_views_with_limit_names[]= {"NO", "YES", 0};
static Sys_var_enum Sys_updatable_views_with_limit(
"updatable_views_with_limit",
"YES = Don't issue an error message (warning only) if a VIEW without "
"presence of a key of the underlying table is used in queries with a "
"LIMIT clause for updating. NO = Prohibit update of a VIEW, which "
"does not contain a key of the underlying table and the query uses "
"a LIMIT clause (usually get from GUI tools)",
SESSION_VAR(updatable_views_with_limit), CMD_LINE(REQUIRED_ARG),
updatable_views_with_limit_names, DEFAULT(TRUE));
static Sys_var_mybool Sys_sync_frm(
"sync_frm", "Sync .frm files to disk on creation",
GLOBAL_VAR(opt_sync_frm), CMD_LINE(OPT_ARG),
DEFAULT(TRUE));
static char *system_time_zone_ptr;
static Sys_var_charptr Sys_system_time_zone(
"system_time_zone", "The server system time zone",
READ_ONLY GLOBAL_VAR(system_time_zone_ptr), NO_CMD_LINE,
IN_FS_CHARSET, DEFAULT(system_time_zone));
static Sys_var_ulong Sys_table_def_size(
"table_definition_cache",
"The number of cached table definitions",
GLOBAL_VAR(table_def_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(TABLE_DEF_CACHE_MIN, 512*1024),
DEFAULT(TABLE_DEF_CACHE_DEFAULT), BLOCK_SIZE(1));
static Sys_var_ulong Sys_table_cache_size(
"table_open_cache", "The number of cached open tables",
GLOBAL_VAR(table_cache_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 512*1024), DEFAULT(TABLE_OPEN_CACHE_DEFAULT),
BLOCK_SIZE(1));
static Sys_var_ulong Sys_table_lock_wait_timeout(
"table_lock_wait_timeout",
"Timeout in seconds to wait for a table level lock before returning an "
"error. Used only if the connection has active cursors",
GLOBAL_VAR(table_lock_wait_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 1024*1024*1024), DEFAULT(50), BLOCK_SIZE(1));
static Sys_var_ulong Sys_thread_cache_size(
"thread_cache_size",
"How many threads we should keep in a cache for reuse",
GLOBAL_VAR(thread_cache_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 16384), DEFAULT(0), BLOCK_SIZE(1));
#if HAVE_POOL_OF_THREADS == 1
static Sys_var_ulong Sys_thread_pool_size(
"thread_pool_size",
"How many threads we should create to handle query requests in "
"case of 'thread_handling=pool-of-threads'",
GLOBAL_VAR(thread_pool_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, 16384), DEFAULT(20), BLOCK_SIZE(0));
#endif
// Can't change the 'next' tx_isolation if we are already in a transaction
static bool check_tx_isolation(sys_var *self, THD *thd, set_var *var)
{
if (var->type == OPT_DEFAULT && (thd->server_status & SERVER_STATUS_IN_TRANS))
{
my_error(ER_CANT_CHANGE_TX_ISOLATION, MYF(0));
return true;
}
return false;
}
/*
If one doesn't use the SESSION modifier, the isolation level
is only active for the next command.
*/
static bool fix_tx_isolation(sys_var *self, THD *thd, enum_var_type type)
{
if (type == OPT_SESSION)
thd->session_tx_isolation= (enum_tx_isolation)thd->variables.tx_isolation;
return false;
}
// NO_CMD_LINE - different name of the option
static Sys_var_enum Sys_tx_isolation(
"tx_isolation", "Default transaction isolation level",
SESSION_VAR(tx_isolation), NO_CMD_LINE,
tx_isolation_names, DEFAULT(ISO_REPEATABLE_READ),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_tx_isolation),
ON_UPDATE(fix_tx_isolation));
static Sys_var_ulonglong Sys_tmp_table_size(
"tmp_table_size",
"If an internal in-memory temporary table exceeds this size, MySQL "
"will automatically convert it to an on-disk MyISAM table",
SESSION_VAR(tmp_table_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1024, (ulonglong)~(intptr)0), DEFAULT(16*1024*1024),
BLOCK_SIZE(1));
static Sys_var_mybool Sys_timed_mutexes(
"timed_mutexes",
"Specify whether to time mutexes (only InnoDB mutexes are currently "
"supported)",
GLOBAL_VAR(timed_mutexes), CMD_LINE(OPT_ARG), DEFAULT(0));
static char *server_version_ptr;
static Sys_var_charptr Sys_version(
"version", "Server version",
READ_ONLY GLOBAL_VAR(server_version_ptr), NO_CMD_LINE,
IN_SYSTEM_CHARSET, DEFAULT(server_version));
static char *server_version_comment_ptr;
static Sys_var_charptr Sys_version_comment(
"version_comment", "version_comment",
READ_ONLY GLOBAL_VAR(server_version_comment_ptr), NO_CMD_LINE,
IN_SYSTEM_CHARSET, DEFAULT(MYSQL_COMPILATION_COMMENT));
static char *server_version_compile_machine_ptr;
static Sys_var_charptr Sys_version_compile_machine(
"version_compile_machine", "version_compile_machine",
READ_ONLY GLOBAL_VAR(server_version_compile_machine_ptr), NO_CMD_LINE,
IN_SYSTEM_CHARSET, DEFAULT(MACHINE_TYPE));
static char *server_version_compile_os_ptr;
static Sys_var_charptr Sys_version_compile_os(
"version_compile_os", "version_compile_os",
READ_ONLY GLOBAL_VAR(server_version_compile_os_ptr), NO_CMD_LINE,
IN_SYSTEM_CHARSET, DEFAULT(SYSTEM_TYPE));
static Sys_var_ulong Sys_net_wait_timeout(
"wait_timeout",
"The number of seconds the server waits for activity on a "
"connection before closing it",
SESSION_VAR(net_wait_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, IF_WIN(INT_MAX32/1000, LONG_TIMEOUT)),
DEFAULT(NET_WAIT_TIMEOUT), BLOCK_SIZE(1));
/** propagates changes to the relevant flag of @@optimizer_switch */
static bool fix_engine_condition_pushdown(sys_var *self, THD *thd,
enum_var_type type)
{
SV *sv= (type == OPT_GLOBAL) ? &global_system_variables : &thd->variables;
if (sv->engine_condition_pushdown)
sv->optimizer_switch|= OPTIMIZER_SWITCH_ENGINE_CONDITION_PUSHDOWN;
else
sv->optimizer_switch&= ~OPTIMIZER_SWITCH_ENGINE_CONDITION_PUSHDOWN;
return false;
}
static Sys_var_mybool Sys_engine_condition_pushdown(
"engine_condition_pushdown",
"Push supported query conditions to the storage engine."
" Deprecated, use --optimizer-switch instead.",
SESSION_VAR(engine_condition_pushdown),
CMD_LINE(OPT_ARG, OPT_ENGINE_CONDITION_PUSHDOWN),
DEFAULT(TRUE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(NULL),
ON_UPDATE(fix_engine_condition_pushdown),
DEPRECATED(70000, "'@@optimizer_switch'"));
static Sys_var_plugin Sys_default_storage_engine(
"default_storage_engine", "The default storage engine for new tables",
SESSION_VAR(table_plugin), NO_CMD_LINE,
MYSQL_STORAGE_ENGINE_PLUGIN, DEFAULT(&default_storage_engine),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_not_null));
// Alias for @@default_storage_engine
static Sys_var_plugin Sys_storage_engine(
"storage_engine", "Alias for @@default_storage_engine. Deprecated",
SESSION_VAR(table_plugin), NO_CMD_LINE,
MYSQL_STORAGE_ENGINE_PLUGIN, DEFAULT(&default_storage_engine),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_not_null));
#if defined(ENABLED_DEBUG_SYNC)
/*
Variable can be set for the session only.
This could be changed later. Then we need to have a global array of
actions in addition to the thread local ones. SET GLOBAL would
manage the global array, SET [SESSION] the local array. A sync point
would need to look for a local and a global action. Setting and
executing of global actions need to be protected by a mutex.
The purpose of global actions could be to allow synchronizing with
connectionless threads that cannot execute SET statements.
*/
static Sys_var_debug_sync Sys_debug_sync(
"debug_sync", "Debug Sync Facility",
sys_var::ONLY_SESSION, NO_CMD_LINE,
DEFAULT(0), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_has_super));
#endif /* defined(ENABLED_DEBUG_SYNC) */
/**
"time_format" "date_format" "datetime_format"
the following three variables are unused, and the source of confusion
(bug reports like "I've changed date_format, but date format hasn't changed.
I've made them read-only, to alleviate the situation somewhat.
@todo make them NO_CMD_LINE ?
*/
static Sys_var_charptr Sys_date_format(
"date_format", "The DATE format (ignored)",
READ_ONLY GLOBAL_VAR(global_date_format.format.str),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(known_date_time_formats[ISO_FORMAT].date_format));
static Sys_var_charptr Sys_datetime_format(
"datetime_format", "The DATETIME format (ignored)",
READ_ONLY GLOBAL_VAR(global_datetime_format.format.str),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(known_date_time_formats[ISO_FORMAT].datetime_format));
static Sys_var_charptr Sys_time_format(
"time_format", "The TIME format (ignored)",
READ_ONLY GLOBAL_VAR(global_time_format.format.str),
CMD_LINE(REQUIRED_ARG), IN_SYSTEM_CHARSET,
DEFAULT(known_date_time_formats[ISO_FORMAT].time_format));
static bool fix_autocommit(sys_var *self, THD *thd, enum_var_type type)
{
if (type == OPT_GLOBAL)
{
if (global_system_variables.option_bits & OPTION_AUTOCOMMIT)
global_system_variables.option_bits&= ~OPTION_NOT_AUTOCOMMIT;
else
global_system_variables.option_bits|= OPTION_NOT_AUTOCOMMIT;
return false;
}
if (thd->variables.option_bits & OPTION_AUTOCOMMIT &&
thd->variables.option_bits & OPTION_NOT_AUTOCOMMIT)
{ // activating autocommit
if (ha_commit(thd))
{
thd->variables.option_bits&= ~OPTION_AUTOCOMMIT;
return true;
}
thd->variables.option_bits&=
~(OPTION_BEGIN | OPTION_KEEP_LOG | OPTION_NOT_AUTOCOMMIT);
thd->transaction.all.modified_non_trans_table= false;
thd->server_status|= SERVER_STATUS_AUTOCOMMIT;
return false;
}
if (!(thd->variables.option_bits & OPTION_AUTOCOMMIT) &&
!(thd->variables.option_bits & OPTION_NOT_AUTOCOMMIT))
{ // disabling autocommit
thd->transaction.all.modified_non_trans_table= false;
thd->server_status&= ~SERVER_STATUS_AUTOCOMMIT;
thd->variables.option_bits|= OPTION_NOT_AUTOCOMMIT;
return false;
}
return false; // autocommit value wasn't changed
}
static Sys_var_bit Sys_autocommit(
"autocommit", "autocommit",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_AUTOCOMMIT, DEFAULT(TRUE),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(fix_autocommit));
export sys_var *Sys_autocommit_ptr= &Sys_autocommit; // for sql_yacc.yy
static Sys_var_mybool Sys_big_tables(
"big_tables", "Allow big result sets by saving all "
"temporary sets on file (Solves most 'table full' errors)",
SESSION_VAR(big_tables), CMD_LINE(OPT_ARG), DEFAULT(FALSE));
#ifndef TO_BE_DELETED /* Alias for big_tables */
static Sys_var_mybool Sys_sql_big_tables(
"sql_big_tables", "alias for big_tables",
SESSION_VAR(big_tables), NO_CMD_LINE, DEFAULT(FALSE));
#endif
static Sys_var_bit Sys_big_selects(
"sql_big_selects", "sql_big_selects",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_BIG_SELECTS,
DEFAULT(FALSE));
static Sys_var_bit Sys_log_off(
"sql_log_off", "sql_log_off",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_LOG_OFF,
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_has_super));
static bool fix_sql_log_bin(sys_var *self, THD *thd, enum_var_type type)
{
if (type != OPT_GLOBAL && !thd->in_sub_stmt)
thd->sql_log_bin_toplevel= thd->variables.option_bits & OPTION_BIN_LOG;
return false;
}
static Sys_var_bit Sys_log_binlog(
"sql_log_bin", "sql_log_bin",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_BIN_LOG,
DEFAULT(TRUE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_has_super),
ON_UPDATE(fix_sql_log_bin));
static bool deprecated_log_update(sys_var *self, THD *thd, set_var *var)
{
/*
The update log is not supported anymore since 5.0.
See sql/mysqld.cc/, comments in function init_server_components() for an
explaination of the different warnings we send below
*/
if (opt_sql_bin_update)
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_UPDATE_LOG_DEPRECATED_TRANSLATED,
ER(ER_UPDATE_LOG_DEPRECATED_TRANSLATED));
else
push_warning(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
ER_UPDATE_LOG_DEPRECATED_IGNORED,
ER(ER_UPDATE_LOG_DEPRECATED_IGNORED));
return check_has_super(self, thd, var);
}
static Sys_var_bit Sys_log_update(
"sql_log_update", "alias for sql_log_bin",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_BIN_LOG,
DEFAULT(TRUE), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(deprecated_log_update), ON_UPDATE(fix_sql_log_bin));
static Sys_var_bit Sys_sql_warnings(
"sql_warnings", "sql_warnings",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_WARNINGS,
DEFAULT(FALSE));
static Sys_var_bit Sys_sql_notes(
"sql_notes", "sql_notes",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_SQL_NOTES,
DEFAULT(TRUE));
static Sys_var_bit Sys_auto_is_null(
"sql_auto_is_null", "sql_auto_is_null",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_AUTO_IS_NULL,
DEFAULT(FALSE), NO_MUTEX_GUARD, IN_BINLOG);
static Sys_var_bit Sys_safe_updates(
"sql_safe_updates", "sql_safe_updates",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_SAFE_UPDATES,
DEFAULT(FALSE));
static Sys_var_bit Sys_buffer_results(
"sql_buffer_result", "sql_buffer_result",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_BUFFER_RESULT,
DEFAULT(FALSE));
static Sys_var_bit Sys_quote_show_create(
"sql_quote_show_create", "sql_quote_show_create",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_QUOTE_SHOW_CREATE,
DEFAULT(TRUE));
static Sys_var_bit Sys_foreign_key_checks(
"foreign_key_checks", "foreign_key_checks",
SESSION_VAR(option_bits), NO_CMD_LINE,
REVERSE(OPTION_NO_FOREIGN_KEY_CHECKS),
DEFAULT(TRUE), NO_MUTEX_GUARD, IN_BINLOG);
static Sys_var_bit Sys_unique_checks(
"unique_checks", "unique_checks",
SESSION_VAR(option_bits), NO_CMD_LINE,
REVERSE(OPTION_RELAXED_UNIQUE_CHECKS),
DEFAULT(TRUE), NO_MUTEX_GUARD, IN_BINLOG);
#ifdef ENABLED_PROFILING
static Sys_var_bit Sys_profiling(
"profiling", "profiling",
SESSION_VAR(option_bits), NO_CMD_LINE, OPTION_PROFILING,
DEFAULT(FALSE));
static Sys_var_ulong Sys_profiling_history_size(
"profiling_history_size", "Limit of query profiling memory",
SESSION_VAR(profiling_history_size), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 100), DEFAULT(15), BLOCK_SIZE(1));
#endif
static Sys_var_harows Sys_select_limit(
"sql_select_limit",
"The maximum number of rows to return from SELECT statements",
SESSION_VAR(select_limit), NO_CMD_LINE,
VALID_RANGE(1, HA_POS_ERROR), DEFAULT(HA_POS_ERROR), BLOCK_SIZE(1));
static bool update_timestamp(THD *thd, set_var *var)
{
if (var->value)
thd->set_time((time_t) var->save_result.ulonglong_value);
else // SET timestamp=DEFAULT
thd->user_time= 0;
return false;
}
static ulonglong read_timestamp(THD *thd)
{
return (ulonglong) thd->start_time;
}
static Sys_var_session_special Sys_timestamp(
"timestamp", "Set the time for this client",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ~(time_t)0), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(0), ON_UPDATE(update_timestamp),
ON_READ(read_timestamp));
static bool update_last_insert_id(THD *thd, set_var *var)
{
if (!var->value)
{
my_error(ER_NO_DEFAULT, MYF(0), var->var->name);
return true;
}
thd->first_successful_insert_id_in_prev_stmt=
var->save_result.ulonglong_value;
return false;
}
static ulonglong read_last_insert_id(THD *thd)
{
return (ulonglong) thd->read_first_successful_insert_id_in_prev_stmt();
}
static Sys_var_session_special Sys_last_insert_id(
"last_insert_id", "The value to be returned from LAST_INSERT_ID()",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONGLONG_MAX), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_last_insert_id), ON_READ(read_last_insert_id));
// alias for last_insert_id(), Sybase-style
static Sys_var_session_special Sys_identity(
"identity", "Synonym for the last_insert_id variable",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONGLONG_MAX), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_last_insert_id), ON_READ(read_last_insert_id));
/*
insert_id should *not* be marked as written to the binlog (i.e., it
should *not* be IN_BINLOG), because we want any statement that
refers to insert_id explicitly to be unsafe. (By "explicitly", we
mean using @@session.insert_id, whereas insert_id is used
"implicitly" when NULL value is inserted into an auto_increment
column).
We want statements referring explicitly to @@session.insert_id to be
unsafe, because insert_id is modified internally by the slave sql
thread when NULL values are inserted in an AUTO_INCREMENT column.
This modification interfers with the value of the
@@session.insert_id variable if @@session.insert_id is referred
explicitly by an insert statement (as is seen by executing "SET
@@session.insert_id=0; CREATE TABLE t (a INT, b INT KEY
AUTO_INCREMENT); INSERT INTO t(a) VALUES (@@session.insert_id);" in
statement-based logging mode: t will be different on master and
slave).
*/
static bool update_insert_id(THD *thd, set_var *var)
{
if (!var->value)
{
my_error(ER_NO_DEFAULT, MYF(0), var->var->name);
return true;
}
thd->force_one_auto_inc_interval(var->save_result.ulonglong_value);
return false;
}
static ulonglong read_insert_id(THD *thd)
{
return thd->auto_inc_intervals_forced.minimum();
}
static Sys_var_session_special Sys_insert_id(
"insert_id", "The value to be used by the following INSERT "
"or ALTER TABLE statement when inserting an AUTO_INCREMENT value",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONGLONG_MAX), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_insert_id), ON_READ(read_insert_id));
static bool update_rand_seed1(THD *thd, set_var *var)
{
if (!var->value)
{
my_error(ER_NO_DEFAULT, MYF(0), var->var->name);
return true;
}
thd->rand.seed1= (ulong) var->save_result.ulonglong_value;
return false;
}
static ulonglong read_rand_seed(THD *thd)
{
return 0;
}
static Sys_var_session_special Sys_rand_seed1(
"rand_seed1", "Sets the internal state of the RAND() "
"generator for replication purposes",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONG_MAX), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_rand_seed1), ON_READ(read_rand_seed));
static bool update_rand_seed2(THD *thd, set_var *var)
{
if (!var->value)
{
my_error(ER_NO_DEFAULT, MYF(0), var->var->name);
return true;
}
thd->rand.seed2= (ulong) var->save_result.ulonglong_value;
return false;
}
static Sys_var_session_special Sys_rand_seed2(
"rand_seed2", "Sets the internal state of the RAND() "
"generator for replication purposes",
sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONG_MAX), BLOCK_SIZE(1),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(0),
ON_UPDATE(update_rand_seed2), ON_READ(read_rand_seed));
static ulonglong read_error_count(THD *thd)
{
return thd->warning_info->error_count();
}
// this really belongs to the SHOW STATUS
static Sys_var_session_special Sys_error_count(
"error_count", "The number of errors that resulted from the "
"last statement that generated messages",
READ_ONLY sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONGLONG_MAX), BLOCK_SIZE(1), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(0), ON_READ(read_error_count));
static ulonglong read_warning_count(THD *thd)
{
return thd->warning_info->warn_count();
}
// this really belongs to the SHOW STATUS
static Sys_var_session_special Sys_warning_count(
"warning_count", "The number of errors, warnings, and notes "
"that resulted from the last statement that generated messages",
READ_ONLY sys_var::ONLY_SESSION, NO_CMD_LINE,
VALID_RANGE(0, ULONGLONG_MAX), BLOCK_SIZE(1), NO_MUTEX_GUARD,
NOT_IN_BINLOG, ON_CHECK(0), ON_UPDATE(0), ON_READ(read_warning_count));
static Sys_var_ulong Sys_default_week_format(
"default_week_format",
"The default week format used by WEEK() functions",
SESSION_VAR(default_week_format), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, 7), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_ulong Sys_group_concat_max_len(
"group_concat_max_len",
"The maximum length of the result of function GROUP_CONCAT()",
SESSION_VAR(group_concat_max_len), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(4, ULONG_MAX), DEFAULT(1024), BLOCK_SIZE(1));
static char *glob_hostname_ptr;
static Sys_var_charptr Sys_hostname(
"hostname", "Server host name",
READ_ONLY GLOBAL_VAR(glob_hostname_ptr), NO_CMD_LINE,
IN_FS_CHARSET, DEFAULT(glob_hostname));
#ifndef EMBEDDED_LIBRARY
static Sys_var_charptr Sys_repl_report_host(
"report_host",
"Hostname or IP of the slave to be reported to the master during "
"slave registration. Will appear in the output of SHOW SLAVE HOSTS. "
"Leave unset if you do not want the slave to register itself with the "
"master. Note that it is not sufficient for the master to simply read "
"the IP of the slave off the socket once the slave connects. Due to "
"NAT and other routing issues, that IP may not be valid for connecting "
"to the slave from the master or other hosts",
READ_ONLY GLOBAL_VAR(report_host), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_repl_report_user(
"report_user",
"The account user name of the slave to be reported to the master "
"during slave registration",
READ_ONLY GLOBAL_VAR(report_user), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_repl_report_password(
"report_password",
"The account password of the slave to be reported to the master "
"during slave registration",
READ_ONLY GLOBAL_VAR(report_password), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_uint Sys_repl_report_port(
"report_port",
"Port for connecting to slave reported to the master during slave "
"registration. Set it only if the slave is listening on a non-default "
"port or if you have a special tunnel from the master or other clients "
"to the slave. If not sure, leave this option unset",
READ_ONLY GLOBAL_VAR(report_port), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(MYSQL_PORT), BLOCK_SIZE(1));
#endif
static Sys_var_mybool Sys_keep_files_on_create(
"keep_files_on_create",
"Don't overwrite stale .MYD and .MYI even if no directory is specified",
SESSION_VAR(keep_files_on_create), CMD_LINE(OPT_ARG),
DEFAULT(FALSE));
static char *license;
static Sys_var_charptr Sys_license(
"license", "The type of license the server has",
READ_ONLY GLOBAL_VAR(license), NO_CMD_LINE, IN_SYSTEM_CHARSET,
DEFAULT(STRINGIFY_ARG(LICENSE)));
static bool check_log_path(sys_var *self, THD *thd, set_var *var)
{
if (!var->value)
return false; // DEFAULT is ok
if (!var->save_result.string_value.str)
return true;
if (var->save_result.string_value.length > FN_REFLEN)
{ // path is too long
my_error(ER_PATH_LENGTH, MYF(0), self->name.str);
return true;
}
char path[FN_REFLEN];
size_t path_length= unpack_filename(path, var->save_result.string_value.str);
if (!path_length)
return true;
MY_STAT f_stat;
if (my_stat(path, &f_stat, MYF(0)))
{
if (!MY_S_ISREG(f_stat.st_mode) || !(f_stat.st_mode & MY_S_IWRITE))
return true; // not a regular writable file
return false;
}
(void) dirname_part(path, var->save_result.string_value.str, &path_length);
if (var->save_result.string_value.length - path_length >= FN_LEN)
{ // filename is too long
my_error(ER_PATH_LENGTH, MYF(0), self->name.str);
return true;
}
if (!path_length) // no path is good path (remember, relative to datadir)
return false;
if (my_access(path, (F_OK|W_OK)))
return true; // directory is not writable
return false;
}
static bool fix_log(char** logname, const char* default_logname,
const char*ext, bool enabled, void (*reopen)(char*))
{
if (!*logname) // SET ... = DEFAULT
{
char buff[FN_REFLEN];
*logname= my_strdup(make_log_name(buff, default_logname, ext),
MYF(MY_FAE+MY_WME));
if (!*logname)
return true;
}
logger.lock_exclusive();
mysql_mutex_unlock(&LOCK_global_system_variables);
if (enabled)
reopen(*logname);
logger.unlock();
mysql_mutex_lock(&LOCK_global_system_variables);
return false;
}
static void reopen_general_log(char* name)
{
logger.get_log_file_handler()->close(0);
logger.get_log_file_handler()->open_query_log(name);
}
static bool fix_general_log_file(sys_var *self, THD *thd, enum_var_type type)
{
return fix_log(&opt_logname, default_logfile_name, ".log", opt_log,
reopen_general_log);
}
static Sys_var_charptr Sys_general_log_path(
"general_log_file", "Log connections and queries to given file",
PREALLOCATED GLOBAL_VAR(opt_logname), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_log_path), ON_UPDATE(fix_general_log_file));
static void reopen_slow_log(char* name)
{
logger.get_slow_log_file_handler()->close(0);
logger.get_slow_log_file_handler()->open_slow_log(name);
}
static bool fix_slow_log_file(sys_var *self, THD *thd, enum_var_type type)
{
return fix_log(&opt_slow_logname, default_logfile_name, "-slow.log",
opt_slow_log, reopen_slow_log);
}
static Sys_var_charptr Sys_slow_log_path(
"slow_query_log_file", "Log slow queries to given log file. "
"Defaults logging to hostname-slow.log. Must be enabled to activate "
"other slow log options",
PREALLOCATED GLOBAL_VAR(opt_slow_logname), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_log_path), ON_UPDATE(fix_slow_log_file));
/// @todo deprecate these four legacy have_PLUGIN variables and use I_S instead
export SHOW_COMP_OPTION have_csv, have_innodb;
export SHOW_COMP_OPTION have_ndbcluster, have_partitioning;
static Sys_var_have Sys_have_csv(
"have_csv", "have_csv",
READ_ONLY GLOBAL_VAR(have_csv), NO_CMD_LINE);
static Sys_var_have Sys_have_innodb(
"have_innodb", "have_innodb",
READ_ONLY GLOBAL_VAR(have_innodb), NO_CMD_LINE);
static Sys_var_have Sys_have_ndbcluster(
"have_ndbcluster", "have_ndbcluster",
READ_ONLY GLOBAL_VAR(have_ndbcluster), NO_CMD_LINE);
static Sys_var_have Sys_have_partition_db(
"have_partitioning", "have_partitioning",
READ_ONLY GLOBAL_VAR(have_partitioning), NO_CMD_LINE);
static Sys_var_have Sys_have_compress(
"have_compress", "have_compress",
READ_ONLY GLOBAL_VAR(have_compress), NO_CMD_LINE);
static Sys_var_have Sys_have_crypt(
"have_crypt", "have_crypt",
READ_ONLY GLOBAL_VAR(have_crypt), NO_CMD_LINE);
static Sys_var_have Sys_have_dlopen(
"have_dynamic_loading", "have_dynamic_loading",
READ_ONLY GLOBAL_VAR(have_dlopen), NO_CMD_LINE);
static Sys_var_have Sys_have_geometry(
"have_geometry", "have_geometry",
READ_ONLY GLOBAL_VAR(have_geometry), NO_CMD_LINE);
static Sys_var_have Sys_have_openssl(
"have_openssl", "have_openssl",
READ_ONLY GLOBAL_VAR(have_ssl), NO_CMD_LINE);
static Sys_var_have Sys_have_profiling(
"have_profiling", "have_profiling",
READ_ONLY GLOBAL_VAR(have_profiling), NO_CMD_LINE);
static Sys_var_have Sys_have_query_cache(
"have_query_cache", "have_query_cache",
READ_ONLY GLOBAL_VAR(have_query_cache), NO_CMD_LINE);
static Sys_var_have Sys_have_rtree_keys(
"have_rtree_keys", "have_rtree_keys",
READ_ONLY GLOBAL_VAR(have_rtree_keys), NO_CMD_LINE);
static Sys_var_have Sys_have_ssl(
"have_ssl", "have_ssl",
READ_ONLY GLOBAL_VAR(have_ssl), NO_CMD_LINE);
static Sys_var_have Sys_have_symlink(
"have_symlink", "have_symlink",
READ_ONLY GLOBAL_VAR(have_symlink), NO_CMD_LINE);
static bool fix_log_state(sys_var *self, THD *thd, enum_var_type type);
static Sys_var_mybool Sys_general_log(
"general_log", "Log connections and queries to a table or log file. "
"Defaults logging to a file hostname.log or a table mysql.general_log"
"if --log-output=TABLE is used",
GLOBAL_VAR(opt_log), CMD_LINE(OPT_ARG),
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_log_state));
// Synonym of "general_log" for consistency with SHOW VARIABLES output
static Sys_var_mybool Sys_log(
"log", "Alias for --general-log. Deprecated",
GLOBAL_VAR(opt_log), NO_CMD_LINE,
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_log_state), DEPRECATED(70000, "'@@general_log'"));
static Sys_var_mybool Sys_slow_query_log(
"slow_query_log",
"Log slow queries to a table or log file. Defaults logging to a file "
"hostname-slow.log or a table mysql.slow_log if --log-output=TABLE is "
"used. Must be enabled to activate other slow log options",
GLOBAL_VAR(opt_slow_log), CMD_LINE(OPT_ARG),
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_log_state));
/* Synonym of "slow_query_log" for consistency with SHOW VARIABLES output */
static Sys_var_mybool Sys_log_slow(
"log_slow_queries",
"Alias for --slow-query-log. Deprecated",
GLOBAL_VAR(opt_slow_log), NO_CMD_LINE,
DEFAULT(FALSE), NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_log_state), DEPRECATED(70000, "'@@slow_query_log'"));
static bool fix_log_state(sys_var *self, THD *thd, enum_var_type type)
{
bool res;
my_bool *newvalptr, newval, oldval;
uint log_type;
if (self == &Sys_general_log || self == &Sys_log)
{
newvalptr= &opt_log;
oldval= logger.get_log_file_handler()->is_open();
log_type= QUERY_LOG_GENERAL;
}
else if (self == &Sys_slow_query_log || self == &Sys_log_slow)
{
newvalptr= &opt_slow_log;
oldval= logger.get_slow_log_file_handler()->is_open();
log_type= QUERY_LOG_SLOW;
}
else
DBUG_ASSERT(FALSE);
newval= *newvalptr;
if (oldval == newval)
return false;
*newvalptr= oldval; // [de]activate_log_handler works that way (sigh)
mysql_mutex_unlock(&LOCK_global_system_variables);
if (!newval)
{
logger.deactivate_log_handler(thd, log_type);
res= false;
}
else
res= logger.activate_log_handler(thd, log_type);
mysql_mutex_lock(&LOCK_global_system_variables);
return res;
}
static bool check_not_empty_set(sys_var *self, THD *thd, set_var *var)
{
return var->save_result.ulonglong_value == 0;
}
static bool fix_log_output(sys_var *self, THD *thd, enum_var_type type)
{
logger.lock_exclusive();
logger.init_slow_log(log_output_options);
logger.init_general_log(log_output_options);
logger.unlock();
return false;
}
static Sys_var_set Sys_log_output(
"log_output", "Syntax: log-output=value[,value...], "
"where \"value\" could be TABLE, FILE or NONE",
GLOBAL_VAR(log_output_options), CMD_LINE(REQUIRED_ARG),
log_output_names, DEFAULT(LOG_FILE), NO_MUTEX_GUARD, NOT_IN_BINLOG,
ON_CHECK(check_not_empty_set), ON_UPDATE(fix_log_output));
#ifdef HAVE_REPLICATION
static Sys_var_mybool Sys_log_slave_updates(
"log_slave_updates", "Tells the slave to log the updates from "
"the slave thread to the binary log. You will need to turn it on if "
"you plan to daisy-chain the slaves",
READ_ONLY GLOBAL_VAR(opt_log_slave_updates), CMD_LINE(OPT_ARG),
DEFAULT(0));
static Sys_var_charptr Sys_relay_log(
"relay_log", "The location and name to use for relay logs",
READ_ONLY GLOBAL_VAR(opt_relay_logname), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_relay_log_index(
"relay_log_index", "The location and name to use for the file "
"that keeps a list of the last relay logs",
READ_ONLY GLOBAL_VAR(opt_relaylog_index_name), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_charptr Sys_relay_log_info_file(
"relay_log_info_file", "The location and name of the file that "
"remembers where the SQL replication thread is in the relay logs",
READ_ONLY GLOBAL_VAR(relay_log_info_file), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static Sys_var_mybool Sys_relay_log_purge(
"relay_log_purge", "if disabled - do not purge relay logs. "
"if enabled - purge them as soon as they are no more needed",
GLOBAL_VAR(relay_log_purge), CMD_LINE(OPT_ARG), DEFAULT(TRUE));
static Sys_var_mybool Sys_relay_log_recovery(
"relay_log_recovery", "Enables automatic relay log recovery "
"right after the database startup, which means that the IO Thread "
"starts re-fetching from the master right after the last transaction "
"processed",
GLOBAL_VAR(relay_log_recovery), CMD_LINE(OPT_ARG), DEFAULT(FALSE));
static Sys_var_charptr Sys_slave_load_tmpdir(
"slave_load_tmpdir", "The location where the slave should put "
"its temporary files when replicating a LOAD DATA INFILE command",
READ_ONLY GLOBAL_VAR(slave_load_tmpdir), CMD_LINE(REQUIRED_ARG),
IN_FS_CHARSET, DEFAULT(0));
static bool fix_slave_net_timeout(sys_var *self, THD *thd, enum_var_type type)
{
mysql_mutex_lock(&LOCK_active_mi);
DBUG_PRINT("info", ("slave_net_timeout=%lu mi->heartbeat_period=%.3f",
slave_net_timeout,
(active_mi? active_mi->heartbeat_period : 0.0)));
if (active_mi && slave_net_timeout < active_mi->heartbeat_period)
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN,
ER_SLAVE_HEARTBEAT_VALUE_OUT_OF_RANGE,
"The current value for master_heartbeat_period"
" exceeds the new value of `slave_net_timeout' sec."
" A sensible value for the period should be"
" less than the timeout.");
mysql_mutex_unlock(&LOCK_active_mi);
return false;
}
static Sys_var_ulong Sys_slave_net_timeout(
"slave_net_timeout", "Number of seconds to wait for more data "
"from a master/slave connection before aborting the read",
GLOBAL_VAR(slave_net_timeout), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(1, LONG_TIMEOUT), DEFAULT(SLAVE_NET_TIMEOUT), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(0),
ON_UPDATE(fix_slave_net_timeout));
static bool check_slave_skip_counter(sys_var *self, THD *thd, set_var *var)
{
bool result= false;
mysql_mutex_lock(&LOCK_active_mi);
mysql_mutex_lock(&active_mi->rli.run_lock);
if (active_mi->rli.slave_running)
{
my_message(ER_SLAVE_MUST_STOP, ER(ER_SLAVE_MUST_STOP), MYF(0));
result= true;
}
mysql_mutex_unlock(&active_mi->rli.run_lock);
mysql_mutex_unlock(&LOCK_active_mi);
return result;
}
static bool fix_slave_skip_counter(sys_var *self, THD *thd, enum_var_type type)
{
mysql_mutex_lock(&LOCK_active_mi);
mysql_mutex_lock(&active_mi->rli.run_lock);
/*
The following test should normally never be true as we test this
in the check function; To be safe against multiple
SQL_SLAVE_SKIP_COUNTER request, we do the check anyway
*/
if (!active_mi->rli.slave_running)
{
mysql_mutex_lock(&active_mi->rli.data_lock);
active_mi->rli.slave_skip_counter= sql_slave_skip_counter;
mysql_mutex_unlock(&active_mi->rli.data_lock);
}
mysql_mutex_unlock(&active_mi->rli.run_lock);
mysql_mutex_unlock(&LOCK_active_mi);
return 0;
}
static Sys_var_uint Sys_slave_skip_counter(
"sql_slave_skip_counter", "sql_slave_skip_counter",
GLOBAL_VAR(sql_slave_skip_counter), NO_CMD_LINE,
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_slave_skip_counter),
ON_UPDATE(fix_slave_skip_counter));
static Sys_var_charptr Sys_slave_skip_errors(
"slave_skip_errors", "Tells the slave thread to continue "
"replication when a query event returns an error from the "
"provided list",
READ_ONLY GLOBAL_VAR(opt_slave_skip_errors), CMD_LINE(REQUIRED_ARG),
IN_SYSTEM_CHARSET, DEFAULT(0));
static Sys_var_ulonglong Sys_relay_log_space_limit(
"relay_log_space_limit", "Maximum space to use for all relay logs",
READ_ONLY GLOBAL_VAR(relay_log_space_limit), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_uint Sys_sync_relaylog_period(
"sync_relay_log", "Synchronously flush relay log to disk after "
"every #th event. Use 0 (default) to disable synchronous flushing",
GLOBAL_VAR(sync_relaylog_period), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_uint Sys_sync_relayloginfo_period(
"sync_relay_log_info", "Synchronously flush relay log info "
"to disk after every #th transaction. Use 0 (default) to disable "
"synchronous flushing",
GLOBAL_VAR(sync_relayloginfo_period), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
#endif
static Sys_var_uint Sys_sync_binlog_period(
"sync_binlog", "Synchronously flush binary log to disk after "
"every #th event. Use 0 (default) to disable synchronous flushing",
GLOBAL_VAR(sync_binlog_period), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
static Sys_var_uint Sys_sync_masterinfo_period(
"sync_master_info", "Synchronously flush master info to disk "
"after every #th event. Use 0 (default) to disable synchronous flushing",
GLOBAL_VAR(sync_masterinfo_period), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, UINT_MAX), DEFAULT(0), BLOCK_SIZE(1));
#ifdef HAVE_REPLICATION
static Sys_var_ulong Sys_slave_trans_retries(
"slave_transaction_retries", "Number of times the slave SQL "
"thread will retry a transaction in case it failed with a deadlock "
"or elapsed lock wait timeout, before giving up and stopping",
GLOBAL_VAR(slave_trans_retries), CMD_LINE(REQUIRED_ARG),
VALID_RANGE(0, ULONG_MAX), DEFAULT(10), BLOCK_SIZE(1));
#endif
static bool check_locale(sys_var *self, THD *thd, set_var *var)
{
if (!var->value)
return false;
MY_LOCALE *locale;
char buff[STRING_BUFFER_USUAL_SIZE];
if (var->value->result_type() == INT_RESULT)
{
int lcno= (int)var->value->val_int();
if (!(locale= my_locale_by_number(lcno)))
{
my_error(ER_UNKNOWN_LOCALE, MYF(0), llstr(lcno, buff));
return true;
}
if (check_not_null(self, thd, var))
return true;
}
else // STRING_RESULT
{
String str(buff, sizeof(buff), system_charset_info), *res;
if (!(res=var->value->val_str(&str)))
return true;
else if (!(locale= my_locale_by_name(res->c_ptr())))
{
ErrConvString err(res);
my_error(ER_UNKNOWN_LOCALE, MYF(0), err.ptr());
return true;
}
}
var->save_result.ptr= locale;
if (!locale->errmsgs->errmsgs)
{
mysql_mutex_lock(&LOCK_error_messages);
if (!locale->errmsgs->errmsgs &&
read_texts(ERRMSG_FILE, locale->errmsgs->language,
&locale->errmsgs->errmsgs,
ER_ERROR_LAST - ER_ERROR_FIRST + 1))
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_WARN, ER_UNKNOWN_ERROR,
"Can't process error message file for locale '%s'",
locale->name);
mysql_mutex_unlock(&LOCK_error_messages);
return true;
}
mysql_mutex_unlock(&LOCK_error_messages);
}
return false;
}
static Sys_var_struct Sys_lc_messages(
"lc_messages", "Set the language used for the error messages",
SESSION_VAR(lc_messages), NO_CMD_LINE,
offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_messages),
NO_MUTEX_GUARD, NOT_IN_BINLOG, ON_CHECK(check_locale));
static Sys_var_struct Sys_lc_time_names(
"lc_time_names", "Set the language used for the month "
"names and the days of the week",
SESSION_VAR(lc_time_names), NO_CMD_LINE,
offsetof(MY_LOCALE, name), DEFAULT(&my_default_lc_time_names),
NO_MUTEX_GUARD, IN_BINLOG, ON_CHECK(check_locale));
static Sys_var_tz Sys_time_zone(
"time_zone", "time_zone",
SESSION_VAR(time_zone), NO_CMD_LINE,
DEFAULT(&default_tz), NO_MUTEX_GUARD, IN_BINLOG);
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