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smarter ALTER TABLE - don't copy the table if only comment or default values are changed

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This commit is contained in:
serg@serg.mylan
2004-10-21 18:10:58 +02:00
parent c593ab8e6e
commit 318fe9db96
7 changed files with 151 additions and 114 deletions
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122
sql/sql_table.cc
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@@ -1093,7 +1093,7 @@ int mysql_prepare_table(THD *thd, HA_CREATE_INFO *create_info,
(From ALTER TABLE)
DESCRIPTION
If one creates a temporary table, this is automaticly opened
If one creates a temporary table, this is automatically opened
no_log is needed for the case of CREATE ... SELECT,
as the logging will be done later in sql_insert.cc
@@ -1424,11 +1424,12 @@ mysql_rename_table(enum db_type base,
{
char from[FN_REFLEN], to[FN_REFLEN];
char tmp_from[NAME_LEN+1], tmp_to[NAME_LEN+1];
handler *file=get_new_handler((TABLE*) 0, base);
handler *file=(base == DB_TYPE_UNKNOWN ? 0 : get_new_handler((TABLE*) 0, base));
int error=0;
DBUG_ENTER("mysql_rename_table");
if (lower_case_table_names == 2 && !(file->table_flags() & HA_FILE_BASED))
if (lower_case_table_names == 2 && file &&
!(file->table_flags() & HA_FILE_BASED))
{
/* Table handler expects to get all file names as lower case */
strmov(tmp_from, old_name);
@@ -1446,13 +1447,15 @@ mysql_rename_table(enum db_type base,
fn_format(from,from,"","",4);
fn_format(to,to, "","",4);
if (!(error=file->rename_table((const char*) from,(const char *) to)))
if (!file ||
!(error=file->rename_table((const char*) from,(const char *) to)))
{
if (rename_file_ext(from,to,reg_ext))
{
error=my_errno;
/* Restore old file name */
file->rename_table((const char*) to,(const char *) from);
if (file)
file->rename_table((const char*) to,(const char *) from);
}
}
delete file;
@@ -2536,7 +2539,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
enum enum_duplicates handle_duplicates,
ALTER_INFO *alter_info, bool do_send_ok)
{
TABLE *table,*new_table;
TABLE *table,*new_table=0;
int error;
char tmp_name[80],old_name[32],new_name_buff[FN_REFLEN];
char new_alias_buff[FN_REFLEN], *table_name, *db, *new_alias, *alias;
@@ -2545,6 +2548,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
ulonglong next_insert_id;
uint db_create_options, used_fields;
enum db_type old_db_type,new_db_type;
bool need_copy_table;
DBUG_ENTER("mysql_alter_table");
thd->proc_info="init";
@@ -2633,7 +2637,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
create_info->row_type=table->row_type;
thd->proc_info="setup";
if (alter_info->is_simple && !table->tmp_table)
if (!(alter_info->flags & ~(ALTER_RENAME | ALTER_KEYS_ONOFF)) &&
!table->tmp_table) // no need to touch frm
{
error=0;
if (new_name != table_name || new_db != db)
@@ -2661,23 +2666,24 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
{
switch (alter_info->keys_onoff) {
case LEAVE_AS_IS:
break;
break;
case ENABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error= table->file->enable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
case DISABLE:
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
VOID(pthread_mutex_lock(&LOCK_open));
wait_while_table_is_used(thd, table, HA_EXTRA_FORCE_REOPEN);
VOID(pthread_mutex_unlock(&LOCK_open));
error=table->file->disable_indexes(HA_KEY_SWITCH_NONUNIQ_SAVE);
/* COND_refresh will be signaled in close_thread_tables() */
break;
}
}
if (error == HA_ERR_WRONG_COMMAND)
{
push_warning_printf(thd, MYSQL_ERROR::WARN_LEVEL_NOTE,
@@ -2708,7 +2714,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
/* Full alter table */
/* let new create options override the old ones */
/* Let new create options override the old ones */
if (!(used_fields & HA_CREATE_USED_MIN_ROWS))
create_info->min_rows=table->min_rows;
if (!(used_fields & HA_CREATE_USED_MAX_ROWS))
@@ -2968,6 +2974,16 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
if (table->tmp_table)
create_info->options|=HA_LEX_CREATE_TMP_TABLE;
/*
better have a negative test here, instead of positive, like
alter_info->flags & ALTER_ADD_COLUMN|ALTER_ADD_INDEX|...
so that ALTER TABLE won't break when somebody will add new flag
*/
need_copy_table=(alter_info->flags & ~(ALTER_CHANGE_COLUMN_DEFAULT|ALTER_OPTIONS) ||
create_info->used_fields & ~(HA_CREATE_USED_COMMENT|HA_CREATE_USED_PASSWORD) ||
table->tmp_table);
create_info->frm_only= !need_copy_table;
/*
Handling of symlinked tables:
If no rename:
@@ -3022,45 +3038,49 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
create_list,key_list,1,0)))
DBUG_RETURN(error);
}
if (table->tmp_table)
if (need_copy_table)
{
TABLE_LIST tbl;
bzero((void*) &tbl, sizeof(tbl));
tbl.db= new_db;
tbl.real_name= tbl.alias= tmp_name;
new_table= open_table(thd, &tbl, &thd->mem_root, 0);
if (table->tmp_table)
{
TABLE_LIST tbl;
bzero((void*) &tbl, sizeof(tbl));
tbl.db= new_db;
tbl.real_name= tbl.alias= tmp_name;
new_table= open_table(thd, &tbl, &thd->mem_root, 0);
}
else
{
char path[FN_REFLEN];
my_snprintf(path, sizeof(path), "%s/%s/%s", mysql_data_home,
new_db, tmp_name);
fn_format(path,path,"","",4);
new_table=open_temporary_table(thd, path, new_db, tmp_name,0);
}
if (!new_table)
{
VOID(quick_rm_table(new_db_type,new_db,tmp_name));
goto err;
}
}
else
{
char path[FN_REFLEN];
my_snprintf(path, sizeof(path), "%s/%s/%s", mysql_data_home,
new_db, tmp_name);
fn_format(path,path,"","",4);
new_table=open_temporary_table(thd, path, new_db, tmp_name,0);
}
if (!new_table)
{
VOID(quick_rm_table(new_db_type,new_db,tmp_name));
goto err;
}
/*
We don't want update TIMESTAMP fields during ALTER TABLE
and copy_data_between_tables uses only write_row() for new_table so
don't need to set up timestamp_on_update_now member.
*/
new_table->timestamp_default_now= 0;
new_table->next_number_field=new_table->found_next_number_field;
thd->count_cuted_fields= CHECK_FIELD_WARN; // calc cuted fields
thd->cuted_fields=0L;
thd->proc_info="copy to tmp table";
next_insert_id=thd->next_insert_id; // Remember for loggin
next_insert_id=thd->next_insert_id; // Remember for logging
copied=deleted=0;
if (!new_table->is_view)
if (new_table && !new_table->is_view)
{
new_table->timestamp_default_now= 0;
new_table->next_number_field=new_table->found_next_number_field;
error=copy_data_between_tables(table,new_table,create_list,
handle_duplicates,
order_num, order, &copied, &deleted);
}
thd->last_insert_id=next_insert_id; // Needed for correct log
thd->count_cuted_fields= CHECK_FIELD_IGNORE;
@@ -3099,8 +3119,11 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
goto end_temporary;
}
intern_close_table(new_table); /* close temporary table */
my_free((gptr) new_table,MYF(0));
if (new_table)
{
intern_close_table(new_table); /* close temporary table */
my_free((gptr) new_table,MYF(0));
}
VOID(pthread_mutex_lock(&LOCK_open));
if (error)
{
@@ -3112,7 +3135,7 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
/*
Data is copied. Now we rename the old table to a temp name,
rename the new one to the old name, remove all entries from the old table
from the cash, free all locks, close the old table and remove it.
from the cache, free all locks, close the old table and remove it.
*/
thd->proc_info="rename result table";
@@ -3151,6 +3174,8 @@ int mysql_alter_table(THD *thd,char *new_db, char *new_name,
error=0;
if (!need_copy_table)
new_db_type=old_db_type=DB_TYPE_UNKNOWN; // this type cannot happen in regular ALTER
if (mysql_rename_table(old_db_type,db,table_name,db,old_name))
{
error=1;
@@ -3443,7 +3468,6 @@ int mysql_recreate_table(THD *thd, TABLE_LIST *table_list,
lex->key_list.empty();
lex->col_list.empty();
lex->alter_info.reset();
lex->alter_info.is_simple= 0; // Force full recreate
bzero((char*) &create_info,sizeof(create_info));
create_info.db_type=DB_TYPE_DEFAULT;
create_info.row_type=ROW_TYPE_DEFAULT;