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bbaae9a2dceacecdd23aba6b7bb686d6248ae7c1
mariadb/mysql-test/r/variables.result
Konstantin Osipov 36290c0923 A pre-requisite patch for the fix for Bug#52044. 
This patch also fixes Bug#55452 "SET PASSWORD is
replicated twice in RBR mode".

The goal of this patch is to remove the release of 
metadata locks from close_thread_tables().
This is necessary to not mistakenly release
the locks in the course of a multi-step
operation that involves multiple close_thread_tables()
or close_tables_for_reopen().

On the same token, move statement commit outside 
close_thread_tables().

Other cleanups:
Cleanup COM_FIELD_LIST.
Don't call close_thread_tables() in COM_SHUTDOWN -- there
are no open tables there that can be closed (we leave
the locked tables mode in THD destructor, and this
close_thread_tables() won't leave it anyway).

Make open_and_lock_tables() and open_and_lock_tables_derived()
call close_thread_tables() upon failure.
Remove the calls to close_thread_tables() that are now
unnecessary.

Simplify the back off condition in Open_table_context.

Streamline metadata lock handling in LOCK TABLES 
implementation.

Add asserts to ensure correct life cycle of 
statement transaction in a session.

Remove a piece of dead code that has also become redundant
after the fix for Bug 37521.

mysql-test/r/variables.result:
  Update results: set @@autocommit and statement transaction/
  prelocked mode.
mysql-test/r/view.result:
  A harmless change in CHECK TABLE <view> status for a broken view.
  If previously a failure to prelock all functions used in a view 
  would leave the connection in LTM_PRELOCKED mode, now we call
  close_thread_tables() from open_and_lock_tables()
  and leave prelocked mode, thus some check in mysql_admin_table() that
  works only in prelocked/locked tables mode is no longer activated.
mysql-test/suite/rpl/r/rpl_row_implicit_commit_binlog.result:
  Fixed Bug#55452 "SET PASSWORD is replicated twice in
  RBR mode": extra binlog events are gone from the
  binary log.
mysql-test/t/variables.test:
  Add a test case: set autocommit and statement transaction/prelocked
  mode.
sql/event_data_objects.cc:
  Simplify code in Event_job_data::execute().
  Move sp_head memory management to lex_end().
sql/event_db_repository.cc:
  Move the release of metadata locks outside
  close_thread_tables().
  Make sure we call close_thread_tables() when
  open_and_lock_tables() fails and remove extra
  code from the events data dictionary.
  Use close_mysql_tables(), a new internal
  function to properly close mysql.* tables
  in the data dictionary.
  Contract Event_db_repository::drop_events_by_field,
  drop_schema_events into one function.
  When dropping all events in a schema,
  make sure we don't mistakenly release all
  locks acquired by DROP DATABASE. These
  include locks on the database name
  and the global intention exclusive
  metadata lock.
sql/event_db_repository.h:
  Function open_event_table() does not require an instance 
  of Event_db_repository.
sql/events.cc:
  Use close_mysql_tables() instead of close_thread_tables()
  to bootstrap events, since the latter no longer
  releases metadata locks.
sql/ha_ndbcluster.cc:
  - mysql_rm_table_part2 no longer releases
  acquired metadata locks. Do it in the caller.
sql/ha_ndbcluster_binlog.cc:
  Deploy the new protocol for closing thread
  tables in run_query() and ndb_binlog_index
  code.
sql/handler.cc:
  Assert that we never call ha_commit_trans/
  ha_rollback_trans in sub-statement, which
  is now the case.
sql/handler.h:
  Add an accessor to check whether THD_TRANS object
  is empty (has no transaction started).
sql/log.cc:
  Update a comment.
sql/log_event.cc:
  Since now we commit/rollback statement transaction in 
  mysql_execute_command(), we need a mechanism to communicate
  from Query_log_event::do_apply_event() to mysql_execute_command()
  that the statement transaction should be rolled back, not committed.
  Ideally it would be a virtual method of THD. I hesitate
  to make THD a virtual base class in this already large patch.
  Use a thd->variables.option_bits for now.
  
  Remove a call to close_thread_tables() from the slave IO
  thread. It doesn't open any tables, and the protocol
  for closing thread tables is more complicated now.
  
  Make sure we properly close thread tables, however, 
  in Load_data_log_event, which doesn't
  follow the standard server execution procedure
  with mysql_execute_command().
  @todo: this piece should use Server_runnable
  framework instead.
  Remove an unnecessary call to mysql_unlock_tables().
sql/rpl_rli.cc:
  Update Relay_log_info::slave_close_thread_tables()
  to follow the new close protocol.
sql/set_var.cc:
  Remove an unused header.
sql/slave.cc:
  Remove an unnecessary call to
  close_thread_tables().
sql/sp.cc:
  Remove unnecessary calls to close_thread_tables()
  from SP DDL implementation. The tables will
  be closed by the caller, in mysql_execute_command().
  When dropping all routines in a database, make sure
  to not mistakenly drop all metadata locks acquired
  so far, they include the scoped lock on the schema.
sql/sp_head.cc:
  Correct the protocol that closes thread tables
  in an SP instruction.
  Clear lex->sphead before cleaning up lex
  with lex_end to make sure that we don't
  delete the sphead twice. It's considered
  to be "cleaner" and more in line with
  future changes than calling delete lex->sphead
  in other places that cleanup the lex.
sql/sp_head.h:
  When destroying m_lex_keeper of an instruction,
  don't delete the sphead that all lex objects
  share. 
  @todo: don't store a reference to routine's sp_head
  instance in instruction's lex.
sql/sql_acl.cc:
  Don't call close_thread_tables() where the caller will
  do that for us.
  Fix Bug#55452 "SET PASSWORD is replicated twice in RBR 
  mode" by disabling RBR replication in change_password()
  function.
  Use close_mysql_tables() in bootstrap and ACL reload
  code to make sure we release all metadata locks.
sql/sql_base.cc:
  This is the main part of the patch:
  - remove manipulation with thd->transaction
  and thd->mdl_context from close_thread_tables().
  Now this function is only responsible for closing
  tables, nothing else.
  This is necessary to be able to easily use
  close_thread_tables() in procedures, that
  involve multiple open/close tables, which all
  need to be protected continuously by metadata
  locks.
  Add asserts ensuring that TABLE object
  is only used when is protected by a metadata lock.
  Simplify the back off condition of Open_table_context,
  we no longer need to look at the autocommit mode.
  Make open_and_lock_tables() and open_normal_and_derived_tables()
  close thread tables and release metadata locks acquired so-far 
  upon failure. This simplifies their usage.
  Implement close_mysql_tables().
sql/sql_base.h:
  Add declaration for close_mysql_tables().
sql/sql_class.cc:
  Remove a piece of dead code that has also become redundant
  after the fix for Bug 37521.
  The code became dead when my_eof() was made a non-protocol method,
  but a method that merely modifies the diagnostics area.
  The code became redundant with the fix for Bug#37521, when 
  we started to cal close_thread_tables() before
  Protocol::end_statement().
sql/sql_do.cc:
  Do nothing in DO if inside a substatement
  (the assert moved out of trans_rollback_stmt).
sql/sql_handler.cc:
  Add comments.
sql/sql_insert.cc:
  Remove dead code. 
  Release metadata locks explicitly at the
  end of the delayed insert thread.
sql/sql_lex.cc:
  Add destruction of lex->sphead to lex_end(),
  lex "reset" method called at the end of each statement.
sql/sql_parse.cc:
  Move close_thread_tables() and other related
  cleanups to mysql_execute_command()
  from dispatch_command(). This has become
  possible after the fix for Bug#37521.
  Mark federated SERVER statements as DDL.
  
  Next step: make sure that we don't store
  eof packet in the query cache, and move
  the query cache code outside mysql_parse.
  
  Brush up the code of COM_FIELD_LIST.
  Remove unnecessary calls to close_thread_tables().
  
  When killing a query, don't report "OK"
  if it was a suicide.
sql/sql_parse.h:
  Remove declaration of a function that is now static.
sql/sql_partition.cc:
  Remove an unnecessary call to close_thread_tables().
sql/sql_plugin.cc:
  open_and_lock_tables() will clean up
  after itself after a failure.
  Move close_thread_tables() above
  end: label, and replace with close_mysql_tables(),
  which will also release the metadata lock
  on mysql.plugin.
sql/sql_prepare.cc:
  Now that we no longer release locks in close_thread_tables()
  statement prepare code has become more straightforward.
  Remove the now redundant check for thd->killed() (used
  only by the backup project) from Execute_server_runnable.
  Reorder code to take into account that now mysql_execute_command()
  performs lex->unit.cleanup() and close_thread_tables().
sql/sql_priv.h:
  Add a new option to server options to interact
  between the slave SQL thread and execution
  framework (hack). @todo: use a virtual
  method of class THD instead.
sql/sql_servers.cc:
  Due to Bug 25705 replication of 
  DROP/CREATE/ALTER SERVER is broken.
  Make sure at least we do not attempt to 
  replicate these statements using RBR,
  as this violates the assert in close_mysql_tables().
sql/sql_table.cc:
  Do not release metadata locks in mysql_rm_table_part2,
  this is done by the caller.
  Do not call close_thread_tables() in mysql_create_table(),
  this is done by the caller. 
  Fix a bug in DROP TABLE under LOCK TABLES when,
  upon error in wait_while_table_is_used() we would mistakenly
  release the metadata lock on a non-dropped table.
  Explicitly release metadata locks when doing an implicit
  commit.
sql/sql_trigger.cc:
  Now that we delete lex->sphead in lex_end(),
  zero the trigger's sphead in lex after loading
  the trigger, to avoid double deletion.
sql/sql_udf.cc:
  Use close_mysql_tables() instead of close_thread_tables().
sql/sys_vars.cc:
  Remove code added in scope of WL#4284 which would
  break when we perform set @@session.autocommit along
  with setting other variables and using tables or functions.
  A test case added to variables.test.
sql/transaction.cc:
  Add asserts.
sql/tztime.cc:
  Use close_mysql_tables() rather than close_thread_tables().
2010-07-27 14:25:53 +04:00

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drop table if exists t1,t2;
set @my_binlog_cache_size =@@global.binlog_cache_size;
set @my_connect_timeout =@@global.connect_timeout;
set @my_delayed_insert_timeout =@@global.delayed_insert_timeout;
set @my_delayed_queue_size =@@global.delayed_queue_size;
set @my_flush =@@global.flush;
set @my_flush_time =@@global.flush_time;
set @my_key_buffer_size =@@global.key_buffer_size;
set @my_max_binlog_cache_size =@@global.max_binlog_cache_size;
set @my_max_binlog_size =@@global.max_binlog_size;
set @my_max_connect_errors =@@global.max_connect_errors;
set @my_max_connections =@@global.max_connections;
set @my_max_delayed_threads =@@global.max_delayed_threads;
set @my_max_heap_table_size =@@global.max_heap_table_size;
set @my_max_insert_delayed_threads=@@global.max_insert_delayed_threads;
set @my_max_join_size =@@global.max_join_size;
set @my_myisam_data_pointer_size =@@global.myisam_data_pointer_size;
set @my_myisam_max_sort_file_size =@@global.myisam_max_sort_file_size;
set @my_net_buffer_length =@@global.net_buffer_length;
set @my_net_write_timeout =@@global.net_write_timeout;
set @my_net_read_timeout =@@global.net_read_timeout;
set @my_query_cache_limit =@@global.query_cache_limit;
set @my_query_cache_type =@@global.query_cache_type;
set @my_rpl_recovery_rank =@@global.rpl_recovery_rank;
set @my_server_id =@@global.server_id;
set @my_slow_launch_time =@@global.slow_launch_time;
set @my_storage_engine =@@global.default_storage_engine;
set @my_thread_cache_size =@@global.thread_cache_size;
set @my_max_allowed_packet =@@global.max_allowed_packet;
set @my_join_buffer_size =@@global.join_buffer_size;
set @`test`=1;
select @test, @`test`, @TEST, @`TEST`, @"teSt";
@test @`test` @TEST @`TEST` @"teSt"
1 1 1 1 1
set @TEST=2;
select @test, @`test`, @TEST, @`TEST`, @"teSt";
@test @`test` @TEST @`TEST` @"teSt"
2 2 2 2 2
set @"tEST"=3;
select @test, @`test`, @TEST, @`TEST`, @"teSt";
@test @`test` @TEST @`TEST` @"teSt"
3 3 3 3 3
set @`TeST`=4;
select @test, @`test`, @TEST, @`TEST`, @"teSt";
@test @`test` @TEST @`TEST` @"teSt"
4 4 4 4 4
select @`teST`:=5;
@`teST`:=5
5
select @test, @`test`, @TEST, @`TEST`, @"teSt";
@test @`test` @TEST @`TEST` @"teSt"
5 5 5 5 5
set @select=2,@t5=1.23456;
select @`select`,@not_used;
@`select` @not_used
2 NULL
set @test_int=10,@test_double=1e-10,@test_string="abcdeghi",@test_string2="abcdefghij",@select=NULL;
select @test_int,@test_double,@test_string,@test_string2,@select;
@test_int @test_double @test_string @test_string2 @select
10 0.0000000001 abcdeghi abcdefghij NULL
set @test_int="hello",@test_double="hello",@test_string="hello",@test_string2="hello";
select @test_int,@test_double,@test_string,@test_string2;
@test_int @test_double @test_string @test_string2
hello hello hello hello
set @test_int="hellohello",@test_double="hellohello",@test_string="hellohello",@test_string2="hellohello";
select @test_int,@test_double,@test_string,@test_string2;
@test_int @test_double @test_string @test_string2
hellohello hellohello hellohello hellohello
set @test_int=null,@test_double=null,@test_string=null,@test_string2=null;
select @test_int,@test_double,@test_string,@test_string2;
@test_int @test_double @test_string @test_string2
NULL NULL NULL NULL
select @t1:=(@t2:=1)+@t3:=4,@t1,@t2,@t3;
@t1:=(@t2:=1)+@t3:=4 @t1 @t2 @t3
5 5 1 4
explain extended select @t1:=(@t2:=1)+@t3:=4,@t1,@t2,@t3;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select (@t1:=((@t2:=1) + (@t3:=4))) AS `@t1:=(@t2:=1)+@t3:=4`,(@t1) AS `@t1`,(@t2) AS `@t2`,(@t3) AS `@t3`
select @t5;
@t5
1.23456
CREATE TABLE t1 (c_id INT(4) NOT NULL, c_name CHAR(20), c_country CHAR(3), PRIMARY KEY(c_id));
INSERT INTO t1 VALUES (1,'Bozo','USA'),(2,'Ronald','USA'),(3,'Kinko','IRE'),(4,'Mr. Floppy','GB');
SELECT @min_cid:=min(c_id), @max_cid:=max(c_id) from t1;
@min_cid:=min(c_id) @max_cid:=max(c_id)
1 4
SELECT * FROM t1 WHERE c_id=@min_cid OR c_id=@max_cid;
c_id c_name c_country
1 Bozo USA
4 Mr. Floppy GB
SELECT * FROM t1 WHERE c_id=@min_cid OR c_id=@max_cid OR c_id=666;
c_id c_name c_country
1 Bozo USA
4 Mr. Floppy GB
ALTER TABLE t1 DROP PRIMARY KEY;
select * from t1 where c_id=@min_cid OR c_id=@max_cid;
c_id c_name c_country
1 Bozo USA
4 Mr. Floppy GB
drop table t1;
set GLOBAL max_join_size=10;
set max_join_size=100;
show variables like 'max_join_size';
Variable_name Value
max_join_size 100
select * from information_schema.session_variables where variable_name like 'max_join_size';
VARIABLE_NAME VARIABLE_VALUE
MAX_JOIN_SIZE 100
show global variables like 'max_join_size';
Variable_name Value
max_join_size 10
select * from information_schema.global_variables where variable_name like 'max_join_size';
VARIABLE_NAME VARIABLE_VALUE
MAX_JOIN_SIZE 10
set GLOBAL max_join_size=2000;
show global variables like 'max_join_size';
Variable_name Value
max_join_size 2000
select * from information_schema.global_variables where variable_name like 'max_join_size';
VARIABLE_NAME VARIABLE_VALUE
MAX_JOIN_SIZE 2000
set max_join_size=DEFAULT;
show variables like 'max_join_size';
Variable_name Value
max_join_size 2000
select * from information_schema.session_variables where variable_name like 'max_join_size';
VARIABLE_NAME VARIABLE_VALUE
MAX_JOIN_SIZE 2000
set GLOBAL max_join_size=DEFAULT;
show global variables like 'max_join_size';
Variable_name Value
max_join_size HA_POS_ERROR
select * from information_schema.global_variables where variable_name like 'max_join_size';
VARIABLE_NAME VARIABLE_VALUE
MAX_JOIN_SIZE HA_POS_ERROR
set @@max_join_size=1000, @@global.max_join_size=2000;
select @@local.max_join_size, @@global.max_join_size;
@@local.max_join_size @@global.max_join_size
1000 2000
select @@identity, length(@@version)>0;
@@identity length(@@version)>0
0 1
select @@VERSION=version();
@@VERSION=version()
1
select last_insert_id(345);
last_insert_id(345)
345
explain extended select last_insert_id(345);
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select last_insert_id(345) AS `last_insert_id(345)`
select @@IDENTITY,last_insert_id(), @@identity;
@@IDENTITY last_insert_id() @@identity
345 345 345
explain extended select @@IDENTITY,last_insert_id(), @@identity;
id select_type table type possible_keys key key_len ref rows filtered Extra
1 SIMPLE NULL NULL NULL NULL NULL NULL NULL NULL No tables used
Warnings:
Note 1003 select @@IDENTITY AS `@@IDENTITY`,last_insert_id() AS `last_insert_id()`,@@identity AS `@@identity`
set big_tables=OFF, big_tables=ON, big_tables=0, big_tables=1, big_tables="OFF", big_tables="ON";
set global concurrent_insert=2;
show variables like 'concurrent_insert';
Variable_name Value
concurrent_insert ALWAYS
select * from information_schema.session_variables where variable_name like 'concurrent_insert';
VARIABLE_NAME VARIABLE_VALUE
CONCURRENT_INSERT ALWAYS
set global concurrent_insert=1;
show variables like 'concurrent_insert';
Variable_name Value
concurrent_insert AUTO
select * from information_schema.session_variables where variable_name like 'concurrent_insert';
VARIABLE_NAME VARIABLE_VALUE
CONCURRENT_INSERT AUTO
set global concurrent_insert=0;
show variables like 'concurrent_insert';
Variable_name Value
concurrent_insert NEVER
select * from information_schema.session_variables where variable_name like 'concurrent_insert';
VARIABLE_NAME VARIABLE_VALUE
CONCURRENT_INSERT NEVER
set global concurrent_insert=DEFAULT;
select @@concurrent_insert;
@@concurrent_insert
AUTO
set global timed_mutexes=ON;
show variables like 'timed_mutexes';
Variable_name Value
timed_mutexes ON
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
VARIABLE_NAME VARIABLE_VALUE
TIMED_MUTEXES ON
set global timed_mutexes=0;
show variables like 'timed_mutexes';
Variable_name Value
timed_mutexes OFF
select * from information_schema.session_variables where variable_name like 'timed_mutexes';
VARIABLE_NAME VARIABLE_VALUE
TIMED_MUTEXES OFF
set default_storage_engine=MYISAM, default_storage_engine="HEAP", global default_storage_engine="MERGE";
show local variables like 'default_storage_engine';
Variable_name Value
default_storage_engine MEMORY
select * from information_schema.session_variables where variable_name like 'default_storage_engine';
VARIABLE_NAME VARIABLE_VALUE
DEFAULT_STORAGE_ENGINE MEMORY
show global variables like 'default_storage_engine';
Variable_name Value
default_storage_engine MRG_MYISAM
select * from information_schema.global_variables where variable_name like 'default_storage_engine';
VARIABLE_NAME VARIABLE_VALUE
DEFAULT_STORAGE_ENGINE MRG_MYISAM
set GLOBAL query_cache_size=102400;
set GLOBAL myisam_max_sort_file_size=2000000;
Warnings:
Warning 1292 Truncated incorrect myisam_max_sort_file_size value: '2000000'
show global variables like 'myisam_max_sort_file_size';
Variable_name Value
myisam_max_sort_file_size 1048576
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_MAX_SORT_FILE_SIZE 1048576
set GLOBAL myisam_max_sort_file_size=default;
show global variables like 'myisam_max_sort_file_size';
Variable_name Value
myisam_max_sort_file_size FILE_SIZE
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_MAX_SORT_FILE_SIZE FILE_SIZE
set global net_retry_count=10, session net_retry_count=10;
set global net_buffer_length=1024, net_write_timeout=200, net_read_timeout=300;
show global variables like 'net_%';
Variable_name Value
net_buffer_length 1024
net_read_timeout 300
net_retry_count 10
net_write_timeout 200
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
VARIABLE_NAME VARIABLE_VALUE
NET_BUFFER_LENGTH 1024
NET_READ_TIMEOUT 300
NET_RETRY_COUNT 10
NET_WRITE_TIMEOUT 200
show session variables like 'net_%';
Variable_name Value
net_buffer_length 16384
net_read_timeout 30
net_retry_count 10
net_write_timeout 60
select * from information_schema.session_variables where variable_name like 'net_%' order by 1;
VARIABLE_NAME VARIABLE_VALUE
NET_BUFFER_LENGTH 16384
NET_READ_TIMEOUT 30
NET_RETRY_COUNT 10
NET_WRITE_TIMEOUT 60
set global net_buffer_length=8000, global net_read_timeout=900, net_write_timeout=1000;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '8000'
show global variables like 'net_%';
Variable_name Value
net_buffer_length 7168
net_read_timeout 900
net_retry_count 10
net_write_timeout 1000
select * from information_schema.global_variables where variable_name like 'net_%' order by 1;
VARIABLE_NAME VARIABLE_VALUE
NET_BUFFER_LENGTH 7168
NET_READ_TIMEOUT 900
NET_RETRY_COUNT 10
NET_WRITE_TIMEOUT 1000
set global net_buffer_length=1;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '1'
show global variables like 'net_buffer_length';
Variable_name Value
net_buffer_length 1024
select * from information_schema.global_variables where variable_name like 'net_buffer_length';
VARIABLE_NAME VARIABLE_VALUE
NET_BUFFER_LENGTH 1024
set global net_buffer_length=2000000000;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '2000000000'
show global variables like 'net_buffer_length';
Variable_name Value
net_buffer_length 1048576
select * from information_schema.global_variables where variable_name like 'net_buffer_length';
VARIABLE_NAME VARIABLE_VALUE
NET_BUFFER_LENGTH 1048576
set character set cp1251_koi8;
show variables like "character_set_client";
Variable_name Value
character_set_client cp1251
select * from information_schema.session_variables where variable_name like 'character_set_client';
VARIABLE_NAME VARIABLE_VALUE
CHARACTER_SET_CLIENT cp1251
select @@timestamp>0;
@@timestamp>0
1
set @@rand_seed1=10000000,@@rand_seed2=1000000;
select ROUND(RAND(),5);
ROUND(RAND(),5)
0.02887
==+ Testing %alloc% system variables +==
==+ NOTE: These values *must* be a multiple of 1024 +==
==+ Other values will be rounded down to nearest multiple +==
==+ Show initial values +==
SHOW VARIABLES WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size');
Variable_name Value
query_alloc_block_size 8192
query_prealloc_size 8192
range_alloc_block_size 4096
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
==+ information_schema data +==
SELECT * FROM information_schema.session_variables
WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size') ORDER BY 1;
VARIABLE_NAME VARIABLE_VALUE
QUERY_ALLOC_BLOCK_SIZE 8192
QUERY_PREALLOC_SIZE 8192
RANGE_ALLOC_BLOCK_SIZE 4096
TRANSACTION_ALLOC_BLOCK_SIZE 8192
TRANSACTION_PREALLOC_SIZE 4096
Testing values that are multiples of 1024
set @@range_alloc_block_size=1024*15+1024;
set @@query_alloc_block_size=1024*15+1024*2;
set @@query_prealloc_size=1024*18-1024;
set @@transaction_alloc_block_size=1024*21-1024*1;
set @@transaction_prealloc_size=1024*21-2048;
==+ Check manipulated values ==+
select @@query_alloc_block_size;
@@query_alloc_block_size
17408
SHOW VARIABLES WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size');
Variable_name Value
query_alloc_block_size 17408
query_prealloc_size 17408
range_alloc_block_size 16384
transaction_alloc_block_size 20480
transaction_prealloc_size 19456
==+ information_schema data +==
SELECT * FROM information_schema.session_variables
WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size') ORDER BY 1;
VARIABLE_NAME VARIABLE_VALUE
QUERY_ALLOC_BLOCK_SIZE 17408
QUERY_PREALLOC_SIZE 17408
RANGE_ALLOC_BLOCK_SIZE 16384
TRANSACTION_ALLOC_BLOCK_SIZE 20480
TRANSACTION_PREALLOC_SIZE 19456
==+ Manipulate variable values +==
Testing values that are not 1024 multiples
set @@range_alloc_block_size=1024*16+1023;
Warnings:
Warning 1292 Truncated incorrect range_alloc_block_size value: '17407'
set @@query_alloc_block_size=1024*17+2;
Warnings:
Warning 1292 Truncated incorrect query_alloc_block_size value: '17410'
set @@query_prealloc_size=1024*18-1023;
Warnings:
Warning 1292 Truncated incorrect query_prealloc_size value: '17409'
set @@transaction_alloc_block_size=1024*20-1;
Warnings:
Warning 1292 Truncated incorrect transaction_alloc_block_size value: '20479'
set @@transaction_prealloc_size=1024*21-1;
Warnings:
Warning 1292 Truncated incorrect transaction_prealloc_size value: '21503'
==+ Check manipulated values ==+
SHOW VARIABLES WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size');
Variable_name Value
query_alloc_block_size 17408
query_prealloc_size 17408
range_alloc_block_size 16384
transaction_alloc_block_size 19456
transaction_prealloc_size 20480
==+ information_schema data +==
SELECT * FROM information_schema.session_variables
WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size') ORDER BY 1;
VARIABLE_NAME VARIABLE_VALUE
QUERY_ALLOC_BLOCK_SIZE 17408
QUERY_PREALLOC_SIZE 17408
RANGE_ALLOC_BLOCK_SIZE 16384
TRANSACTION_ALLOC_BLOCK_SIZE 19456
TRANSACTION_PREALLOC_SIZE 20480
==+ Set values back to the default values +==
set @@range_alloc_block_size=default;
set @@query_alloc_block_size=default, @@query_prealloc_size=default;
set transaction_alloc_block_size=default, @@transaction_prealloc_size=default;
==+ Check the values now that they are reset +==
SHOW VARIABLES WHERE variable_name IN ('range_alloc_block_size',
'query_alloc_block_size', 'query_prealloc_size',
'transaction_alloc_block_size', 'transaction_prealloc_size');
Variable_name Value
query_alloc_block_size 8192
query_prealloc_size 8192
range_alloc_block_size 4096
transaction_alloc_block_size 8192
transaction_prealloc_size 4096
SELECT @@version LIKE 'non-existent';
@@version LIKE 'non-existent'
0
SELECT @@version_compile_os LIKE 'non-existent';
@@version_compile_os LIKE 'non-existent'
0
set big_tables=OFFF;
ERROR 42000: Variable 'big_tables' can't be set to the value of 'OFFF'
set big_tables="OFFF";
ERROR 42000: Variable 'big_tables' can't be set to the value of 'OFFF'
set unknown_variable=1;
ERROR HY000: Unknown system variable 'unknown_variable'
set max_join_size="hello";
ERROR 42000: Incorrect argument type to variable 'max_join_size'
set default_storage_engine=UNKNOWN_TABLE_TYPE;
ERROR 42000: Unknown storage engine 'UNKNOWN_TABLE_TYPE'
set default_storage_engine=MERGE, big_tables=2;
ERROR 42000: Variable 'big_tables' can't be set to the value of '2'
show local variables like 'default_storage_engine';
Variable_name Value
default_storage_engine MEMORY
set SESSION query_cache_size=10000;
ERROR HY000: Variable 'query_cache_size' is a GLOBAL variable and should be set with SET GLOBAL
set character_set_client=UNKNOWN_CHARACTER_SET;
ERROR 42000: Unknown character set: 'UNKNOWN_CHARACTER_SET'
set collation_connection=UNKNOWN_COLLATION;
ERROR HY000: Unknown collation: 'UNKNOWN_COLLATION'
set character_set_client=NULL;
ERROR 42000: Variable 'character_set_client' can't be set to the value of 'NULL'
set collation_connection=NULL;
ERROR 42000: Variable 'collation_connection' can't be set to the value of 'NULL'
select @@global.timestamp;
ERROR HY000: Variable 'timestamp' is a SESSION variable
set @@version='';
ERROR HY000: Variable 'version' is a read only variable
set @@concurrent_insert=1;
ERROR HY000: Variable 'concurrent_insert' is a GLOBAL variable and should be set with SET GLOBAL
set myisam_max_sort_file_size=100;
ERROR HY000: Variable 'myisam_max_sort_file_size' is a GLOBAL variable and should be set with SET GLOBAL
set @@SQL_WARNINGS=NULL;
ERROR 42000: Variable 'sql_warnings' can't be set to the value of 'NULL'
set autocommit=1;
set big_tables=1;
select @@autocommit, @@big_tables;
@@autocommit @@big_tables
1 1
set global binlog_cache_size=100;
Warnings:
Warning 1292 Truncated incorrect binlog_cache_size value: '100'
set bulk_insert_buffer_size=100;
set character set cp1251_koi8;
set character set default;
set @@global.concurrent_insert=1;
set global connect_timeout=100;
select @@delay_key_write;
@@delay_key_write
ON
set global delay_key_write="OFF";
select @@delay_key_write;
@@delay_key_write
OFF
set global delay_key_write=ALL;
select @@delay_key_write;
@@delay_key_write
ALL
set global delay_key_write=1;
select @@delay_key_write;
@@delay_key_write
ON
set global delayed_insert_limit=100;
set global delayed_insert_timeout=100;
set global delayed_queue_size=100;
set global flush=1;
set global flush_time=100;
set insert_id=1;
set interactive_timeout=100;
set join_buffer_size=100;
Warnings:
Warning 1292 Truncated incorrect join_buffer_size value: '100'
set last_insert_id=1;
set global local_infile=1;
set long_query_time=0.000001;
select @@long_query_time;
@@long_query_time
0.000001
set long_query_time=100.000001;
select @@long_query_time;
@@long_query_time
100.000001
set low_priority_updates=1;
set global max_allowed_packet=100;
Warnings:
Warning 1292 Truncated incorrect max_allowed_packet value: '100'
set global max_binlog_cache_size=100;
Warnings:
Warning 1292 Truncated incorrect max_binlog_cache_size value: '100'
set global max_binlog_size=100;
Warnings:
Warning 1292 Truncated incorrect max_binlog_size value: '100'
set global max_connect_errors=100;
set global max_connections=100;
set global max_delayed_threads=100;
set max_heap_table_size=100;
Warnings:
Warning 1292 Truncated incorrect max_heap_table_size value: '100'
set max_join_size=100;
set max_sort_length=100;
set max_tmp_tables=100;
set global max_user_connections=100;
select @@max_user_connections;
@@max_user_connections
100
set global max_write_lock_count=100;
set myisam_sort_buffer_size=100;
Warnings:
Warning 1292 Truncated incorrect myisam_sort_buffer_size value: '100'
set global net_buffer_length=100;
Warnings:
Warning 1292 Truncated incorrect net_buffer_length value: '100'
set net_read_timeout=100;
set net_write_timeout=100;
set global query_cache_limit=100;
set global query_cache_size=100;
Warnings:
Warning 1292 Truncated incorrect query_cache_size value: '100'
set global query_cache_type=demand;
set read_buffer_size=100;
Warnings:
Warning 1292 Truncated incorrect read_buffer_size value: '100'
set read_rnd_buffer_size=100;
set global rpl_recovery_rank=100;
Warnings:
Warning 1287 The syntax '@@rpl_recovery_rank' is deprecated and will be removed in MySQL 7.0.
set global server_id=100;
set global slow_launch_time=100;
set sort_buffer_size=100;
Warnings:
Warning 1292 Truncated incorrect sort_buffer_size value: '100'
set @@max_sp_recursion_depth=10;
select @@max_sp_recursion_depth;
@@max_sp_recursion_depth
10
set @@max_sp_recursion_depth=0;
select @@max_sp_recursion_depth;
@@max_sp_recursion_depth
0
set sql_auto_is_null=1;
select @@sql_auto_is_null;
@@sql_auto_is_null
1
set @@sql_auto_is_null=0;
select @@sql_auto_is_null;
@@sql_auto_is_null
0
set sql_big_selects=1;
set sql_big_tables=1;
set sql_buffer_result=1;
set sql_log_bin=1;
set sql_log_off=1;
set sql_low_priority_updates=1;
set sql_quote_show_create=1;
set sql_safe_updates=1;
set sql_select_limit=1;
set sql_select_limit=default;
set sql_warnings=1;
set global table_open_cache=100;
set default_storage_engine=myisam;
set global thread_cache_size=100;
set timestamp=1, timestamp=default;
set tmp_table_size=100;
Warnings:
Warning 1292 Truncated incorrect tmp_table_size value: '100'
set tx_isolation="READ-COMMITTED";
set wait_timeout=100;
set log_warnings=1;
set global log_warnings=1;
select @@session.insert_id;
@@session.insert_id
1
set @save_insert_id=@@session.insert_id;
set session insert_id=20;
select @@session.insert_id;
@@session.insert_id
20
set session last_insert_id=100;
select @@session.insert_id;
@@session.insert_id
20
select @@session.last_insert_id;
@@session.last_insert_id
100
select @@session.insert_id;
@@session.insert_id
20
set @@session.insert_id=@save_insert_id;
select @@session.insert_id;
@@session.insert_id
1
create table t1 (a int not null auto_increment, primary key(a));
create table t2 (a int not null auto_increment, primary key(a));
insert into t1 values(null),(null),(null);
insert into t2 values(null),(null),(null);
set global key_buffer_size=100000;
Warnings:
Warning 1292 Truncated incorrect key_buffer_size value: '100000'
select @@key_buffer_size;
@@key_buffer_size
98304
select * from t1 where a=2;
a
2
select * from t2 where a=3;
a
3
check table t1,t2;
Table Op Msg_type Msg_text
test.t1 check status OK
test.t2 check status OK
select max(a) +1, max(a) +2 into @xx,@yy from t1;
drop table t1,t2;
select @@xxxxxxxxxx;
ERROR HY000: Unknown system variable 'xxxxxxxxxx'
select 1;
1
1
select @@session.key_buffer_size;
ERROR HY000: Variable 'key_buffer_size' is a GLOBAL variable
set ft_boolean_syntax = @@init_connect;
ERROR HY000: Variable 'ft_boolean_syntax' is a GLOBAL variable and should be set with SET GLOBAL
set global ft_boolean_syntax = @@init_connect;
ERROR 42000: Variable 'ft_boolean_syntax' can't be set to the value of ''
set init_connect = NULL;
ERROR HY000: Variable 'init_connect' is a GLOBAL variable and should be set with SET GLOBAL
set global init_connect = NULL;
set ft_boolean_syntax = @@init_connect;
ERROR HY000: Variable 'ft_boolean_syntax' is a GLOBAL variable and should be set with SET GLOBAL
set global ft_boolean_syntax = @@init_connect;
ERROR 42000: Variable 'ft_boolean_syntax' can't be set to the value of ''
set global myisam_max_sort_file_size=4294967296;
show global variables like 'myisam_max_sort_file_size';
Variable_name Value
myisam_max_sort_file_size MAX_FILE_SIZE
select * from information_schema.global_variables where variable_name like 'myisam_max_sort_file_size';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_MAX_SORT_FILE_SIZE MAX_FILE_SIZE
set global myisam_max_sort_file_size=default;
select @@global.max_user_connections,@@local.max_join_size;
@@global.max_user_connections @@local.max_join_size
100 100
set @svc=@@global.max_user_connections, @svj=@@local.max_join_size;
select @@global.max_user_connections,@@local.max_join_size;
@@global.max_user_connections @@local.max_join_size
100 100
set @@global.max_user_connections=111,@@local.max_join_size=222;
select @@global.max_user_connections,@@local.max_join_size;
@@global.max_user_connections @@local.max_join_size
111 222
set @@global.max_user_connections=@@local.max_join_size,@@local.max_join_size=@@global.max_user_connections;
select @@global.max_user_connections,@@local.max_join_size;
@@global.max_user_connections @@local.max_join_size
222 111
set @@global.max_user_connections=@svc, @@local.max_join_size=@svj;
select @@global.max_user_connections,@@local.max_join_size;
@@global.max_user_connections @@local.max_join_size
100 100
set @a=1, @b=2;
set @a=@b, @b=@a;
select @a, @b;
@a @b
2 1
set @@global.global.key_buffer_size= 1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_buffer_size= 1' at line 1
set GLOBAL global.key_buffer_size= 1;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_buffer_size= 1' at line 1
SELECT @@global.global.key_buffer_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_buffer_size' at line 1
SELECT @@global.session.key_buffer_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_buffer_size' at line 1
SELECT @@global.local.key_buffer_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near 'key_buffer_size' at line 1
set @tstlw = @@log_warnings;
show global variables like 'log_warnings';
Variable_name Value
log_warnings 1
select * from information_schema.global_variables where variable_name like 'log_warnings';
VARIABLE_NAME VARIABLE_VALUE
LOG_WARNINGS 1
set global log_warnings = 0;
show global variables like 'log_warnings';
Variable_name Value
log_warnings 0
select * from information_schema.global_variables where variable_name like 'log_warnings';
VARIABLE_NAME VARIABLE_VALUE
LOG_WARNINGS 0
set global log_warnings = 42;
show global variables like 'log_warnings';
Variable_name Value
log_warnings 42
select * from information_schema.global_variables where variable_name like 'log_warnings';
VARIABLE_NAME VARIABLE_VALUE
LOG_WARNINGS 42
set global log_warnings = @tstlw;
show global variables like 'log_warnings';
Variable_name Value
log_warnings 1
select * from information_schema.global_variables where variable_name like 'log_warnings';
VARIABLE_NAME VARIABLE_VALUE
LOG_WARNINGS 1
create table t1 (
c1 tinyint,
c2 smallint,
c3 mediumint,
c4 int,
c5 bigint);
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` tinyint(4) DEFAULT NULL,
`c2` smallint(6) DEFAULT NULL,
`c3` mediumint(9) DEFAULT NULL,
`c4` int(11) DEFAULT NULL,
`c5` bigint(20) DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
set @arg00= 8, @arg01= 8.8, @arg02= 'a string', @arg03= 0.2e0;
create table t1 as select @arg00 as c1, @arg01 as c2, @arg02 as c3, @arg03 as c4;
show create table t1;
Table Create Table
t1 CREATE TABLE `t1` (
`c1` bigint(20) DEFAULT NULL,
`c2` decimal(65,30) DEFAULT NULL,
`c3` longtext,
`c4` double DEFAULT NULL
) ENGINE=MyISAM DEFAULT CHARSET=latin1
drop table t1;
SET GLOBAL MYISAM_DATA_POINTER_SIZE= 7;
SHOW VARIABLES LIKE 'MYISAM_DATA_POINTER_SIZE';
Variable_name Value
myisam_data_pointer_size 7
SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME LIKE 'MYISAM_DATA_POINTER_SIZE';
VARIABLE_NAME VARIABLE_VALUE
MYISAM_DATA_POINTER_SIZE 7
SET GLOBAL table_open_cache=-1;
Warnings:
Warning 1292 Truncated incorrect table_open_cache value: '-1'
SHOW VARIABLES LIKE 'table_open_cache';
Variable_name Value
table_open_cache 1
SELECT * FROM INFORMATION_SCHEMA.SESSION_VARIABLES WHERE VARIABLE_NAME LIKE 'table_open_cache';
VARIABLE_NAME VARIABLE_VALUE
TABLE_OPEN_CACHE 1
SET GLOBAL table_open_cache=DEFAULT;
set character_set_results=NULL;
select ifnull(@@character_set_results,"really null");
ifnull(@@character_set_results,"really null")
really null
set names latin1;
select @@have_innodb;
@@have_innodb
#
*** Various tests with LC_TIME_NAMES
*** LC_TIME_NAMES: testing case insensitivity
set @@lc_time_names='ru_ru';
select @@lc_time_names;
@@lc_time_names
ru_RU
*** LC_TIME_NAMES: testing with a user variable
set @lc='JA_JP';
set @@lc_time_names=@lc;
select @@lc_time_names;
@@lc_time_names
ja_JP
*** LC_TIME_NAMES: testing with string expressions
set lc_time_names=concat('de','_','DE');
select @@lc_time_names;
@@lc_time_names
de_DE
set lc_time_names=concat('de','+','DE');
ERROR HY000: Unknown locale: 'de+DE'
select @@lc_time_names;
@@lc_time_names
de_DE
LC_TIME_NAMES: testing with numeric expressions
set @@lc_time_names=1+2;
select @@lc_time_names;
@@lc_time_names
sv_SE
set @@lc_time_names=1/0;
ERROR 42000: Incorrect argument type to variable 'lc_time_names'
select @@lc_time_names;
@@lc_time_names
sv_SE
set lc_time_names=en_US;
LC_TIME_NAMES: testing NULL and a negative number:
set lc_time_names=NULL;
ERROR 42000: Variable 'lc_time_names' can't be set to the value of 'NULL'
set lc_time_names=-1;
ERROR HY000: Unknown locale: '-1'
select @@lc_time_names;
@@lc_time_names
en_US
LC_TIME_NAMES: testing locale with the last ID:
set lc_time_names=109;
select @@lc_time_names;
@@lc_time_names
el_GR
LC_TIME_NAMES: testing a number beyond the valid ID range:
set lc_time_names=110;
ERROR HY000: Unknown locale: '110'
select @@lc_time_names;
@@lc_time_names
el_GR
LC_TIME_NAMES: testing that 0 is en_US:
set lc_time_names=0;
select @@lc_time_names;
@@lc_time_names
en_US
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
en_US en_US
set @@global.lc_time_names=fr_FR;
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
fr_FR en_US
New connection
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
fr_FR fr_FR
set @@lc_time_names=ru_RU;
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
fr_FR ru_RU
Returnung to default connection
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
fr_FR en_US
set lc_time_names=default;
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
fr_FR fr_FR
set @@global.lc_time_names=default;
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
en_US fr_FR
set @@lc_time_names=default;
select @@global.lc_time_names, @@lc_time_names;
@@global.lc_time_names @@lc_time_names
en_US en_US
set @test = @@query_prealloc_size;
set @@query_prealloc_size = @test;
select @@query_prealloc_size = @test;
@@query_prealloc_size = @test
1
set global sql_mode=repeat('a',80);
ERROR 42000: Variable 'sql_mode' can't be set to the value of 'aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa'
End of 4.1 tests
create table t1 (a int);
select a into @x from t1;
Warnings:
Warning 1329 No data - zero rows fetched, selected, or processed
show warnings;
Level Code Message
Warning 1329 No data - zero rows fetched, selected, or processed
drop table t1;
set @@warning_count=1;
ERROR HY000: Variable 'warning_count' is a read only variable
set @@global.error_count=1;
ERROR HY000: Variable 'error_count' is a read only variable
set @@max_heap_table_size= 4294967296;
select @@max_heap_table_size > 0;
@@max_heap_table_size > 0
1
set global max_heap_table_size= 4294967296;
select @@max_heap_table_size > 0;
@@max_heap_table_size > 0
1
set @@max_heap_table_size= 4294967296;
select @@max_heap_table_size > 0;
@@max_heap_table_size > 0
1
select @@character_set_system;
@@character_set_system
utf8
set global character_set_system = latin1;
ERROR HY000: Variable 'character_set_system' is a read only variable
set @@global.version_compile_os='234';
ERROR HY000: Variable 'version_compile_os' is a read only variable
set character_set_filesystem=latin1;
select @@character_set_filesystem;
@@character_set_filesystem
latin1
set @@global.character_set_filesystem=latin2;
set character_set_filesystem=latin1;
select @@character_set_filesystem;
@@character_set_filesystem
latin1
set @@global.character_set_filesystem=latin2;
set character_set_filesystem=default;
select @@character_set_filesystem;
@@character_set_filesystem
latin2
set @@global.character_set_filesystem=default;
select @@global.character_set_filesystem;
@@global.character_set_filesystem
binary
set @old_sql_big_selects = @@sql_big_selects;
set @@sql_big_selects = 1;
show variables like 'sql_big_selects';
Variable_name Value
sql_big_selects ON
select * from information_schema.session_variables where variable_name like 'sql_big_selects';
VARIABLE_NAME VARIABLE_VALUE
SQL_BIG_SELECTS ON
set @@sql_big_selects = @old_sql_big_selects;
set @@sql_notes = 0, @@sql_warnings = 0;
show variables like 'sql_notes';
Variable_name Value
sql_notes OFF
select * from information_schema.session_variables where variable_name like 'sql_notes';
VARIABLE_NAME VARIABLE_VALUE
SQL_NOTES OFF
show variables like 'sql_warnings';
Variable_name Value
sql_warnings OFF
select * from information_schema.session_variables where variable_name like 'sql_warnings';
VARIABLE_NAME VARIABLE_VALUE
SQL_WARNINGS OFF
set @@sql_notes = 1, @@sql_warnings = 1;
show variables like 'sql_notes';
Variable_name Value
sql_notes ON
select * from information_schema.session_variables where variable_name like 'sql_notes';
VARIABLE_NAME VARIABLE_VALUE
SQL_NOTES ON
show variables like 'sql_warnings';
Variable_name Value
sql_warnings ON
select * from information_schema.session_variables where variable_name like 'sql_warnings';
VARIABLE_NAME VARIABLE_VALUE
SQL_WARNINGS ON
select @@system_time_zone;
@@system_time_zone
#
select @@version, @@version_comment, @@version_compile_machine,
@@version_compile_os;
@@version @@version_comment @@version_compile_machine @@version_compile_os
# # # #
select @@basedir, @@datadir, @@tmpdir;
@@basedir @@datadir @@tmpdir
# # #
show variables like 'basedir';
Variable_name Value
basedir #
select * from information_schema.session_variables where variable_name like 'basedir';
VARIABLE_NAME VARIABLE_VALUE
BASEDIR #
show variables like 'datadir';
Variable_name Value
datadir #
select * from information_schema.session_variables where variable_name like 'datadir';
VARIABLE_NAME VARIABLE_VALUE
DATADIR #
show variables like 'tmpdir';
Variable_name Value
tmpdir #
select * from information_schema.session_variables where variable_name like 'tmpdir';
VARIABLE_NAME VARIABLE_VALUE
TMPDIR #
select @@ssl_ca, @@ssl_capath, @@ssl_cert, @@ssl_cipher, @@ssl_key;
@@ssl_ca @@ssl_capath @@ssl_cert @@ssl_cipher @@ssl_key
# # # # #
show variables like 'ssl%';
Variable_name Value
ssl_ca #
ssl_capath #
ssl_cert #
ssl_cipher #
ssl_key #
select * from information_schema.session_variables where variable_name like 'ssl%' order by 1;
VARIABLE_NAME VARIABLE_VALUE
SSL_CA #
SSL_CAPATH #
SSL_CERT #
SSL_CIPHER #
SSL_KEY #
select @@log_queries_not_using_indexes;
@@log_queries_not_using_indexes
0
show variables like 'log_queries_not_using_indexes';
Variable_name Value
log_queries_not_using_indexes OFF
select * from information_schema.session_variables where variable_name like 'log_queries_not_using_indexes';
VARIABLE_NAME VARIABLE_VALUE
LOG_QUERIES_NOT_USING_INDEXES OFF
select @@"";
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '""' at line 1
select @@&;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '&' at line 1
select @@@;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your MySQL server version for the right syntax to use near '@' at line 1
select @@hostname;
@@hostname
#
set @@hostname= "anothername";
ERROR HY000: Variable 'hostname' is a read only variable
show variables like 'hostname';
Variable_name Value
hostname #
#
# BUG#37408 - Compressed MyISAM files should not require/use mmap()
#
# Test 'myisam_mmap_size' option is not dynamic
SET @@myisam_mmap_size= 500M;
ERROR HY000: Variable 'myisam_mmap_size' is a read only variable
#
# Bug #52315: utc_date() crashes when system time > year 2037
#
SET TIMESTAMP=2*1024*1024*1024;
#Should not crash
SELECT UTC_DATE();
SET TIMESTAMP=DEFAULT;
End of 5.0 tests
set join_buffer_size=1;
Warnings:
Warning 1292 Truncated incorrect join_buffer_size value: '1'
set @save_join_buffer_size=@@join_buffer_size;
set join_buffer_size=@save_join_buffer_size;
set global binlog_cache_size =@my_binlog_cache_size;
set global connect_timeout =@my_connect_timeout;
set global delayed_insert_timeout =@my_delayed_insert_timeout;
set global delayed_queue_size =@my_delayed_queue_size;
set global flush =@my_flush;
set global flush_time =@my_flush_time;
set global key_buffer_size =@my_key_buffer_size;
set global max_binlog_cache_size =@my_max_binlog_cache_size;
set global max_binlog_size =@my_max_binlog_size;
set global max_connect_errors =@my_max_connect_errors;
set global max_connections =@my_max_connections;
set global max_delayed_threads =@my_max_delayed_threads;
set global max_heap_table_size =@my_max_heap_table_size;
set global max_insert_delayed_threads=@my_max_insert_delayed_threads;
set global max_join_size =@my_max_join_size;
set global max_user_connections =default;
set global max_write_lock_count =default;
set global myisam_data_pointer_size =@my_myisam_data_pointer_size;
set global myisam_max_sort_file_size =@my_myisam_max_sort_file_size;
set global net_buffer_length =@my_net_buffer_length;
set global net_write_timeout =@my_net_write_timeout;
set global net_read_timeout =@my_net_read_timeout;
set global query_cache_limit =@my_query_cache_limit;
set global query_cache_type =@my_query_cache_type;
set global rpl_recovery_rank =@my_rpl_recovery_rank;
Warnings:
Warning 1287 The syntax '@@rpl_recovery_rank' is deprecated and will be removed in MySQL 7.0.
set global server_id =@my_server_id;
set global slow_launch_time =@my_slow_launch_time;
set global default_storage_engine =@my_storage_engine;
set global thread_cache_size =@my_thread_cache_size;
set global max_allowed_packet =@my_max_allowed_packet;
set global join_buffer_size =@my_join_buffer_size;
show global variables where Variable_name='table_definition_cache';
Variable_name Value
table_definition_cache #
# --
# -- Bug#34820: log_output can be set to illegal value.
# --
SET GLOBAL log_output = '';
ERROR 42000: Variable 'log_output' can't be set to the value of ''
SET GLOBAL log_output = 0;
ERROR 42000: Variable 'log_output' can't be set to the value of '0'
# -- End of Bug#34820.
#
SHOW VARIABLES like 'ft_max_word_len';
Variable_name Value
ft_max_word_len 84
SELECT @@session.ft_max_word_len;
ERROR HY000: Variable 'ft_max_word_len' is a GLOBAL variable
SELECT @@global.ft_max_word_len;
@@global.ft_max_word_len
84
SET @@session.ft_max_word_len= 7;
ERROR HY000: Variable 'ft_max_word_len' is a read only variable
SET @@global.ft_max_word_len= 7;
ERROR HY000: Variable 'ft_max_word_len' is a read only variable
#
SHOW VARIABLES like 'ft_min_word_len';
Variable_name Value
ft_min_word_len 4
SELECT @@session.ft_min_word_len;
ERROR HY000: Variable 'ft_min_word_len' is a GLOBAL variable
SELECT @@global.ft_min_word_len;
@@global.ft_min_word_len
4
SET @@session.ft_min_word_len= 7;
ERROR HY000: Variable 'ft_min_word_len' is a read only variable
SET @@global.ft_min_word_len= 7;
ERROR HY000: Variable 'ft_min_word_len' is a read only variable
#
SHOW VARIABLES like 'ft_query_expansion_limit';
Variable_name Value
ft_query_expansion_limit 20
SELECT @@session.ft_query_expansion_limit;
ERROR HY000: Variable 'ft_query_expansion_limit' is a GLOBAL variable
SELECT @@global.ft_query_expansion_limit;
@@global.ft_query_expansion_limit
20
SET @@session.ft_query_expansion_limit= 7;
ERROR HY000: Variable 'ft_query_expansion_limit' is a read only variable
SET @@global.ft_query_expansion_limit= 7;
ERROR HY000: Variable 'ft_query_expansion_limit' is a read only variable
#
SHOW VARIABLES like 'ft_stopword_file';
Variable_name Value
ft_stopword_file (built-in)
SELECT @@session.ft_stopword_file;
ERROR HY000: Variable 'ft_stopword_file' is a GLOBAL variable
SELECT @@global.ft_stopword_file;
@@global.ft_stopword_file
(built-in)
SET @@session.ft_stopword_file= 'x';
ERROR HY000: Variable 'ft_stopword_file' is a read only variable
SET @@global.ft_stopword_file= 'x';
ERROR HY000: Variable 'ft_stopword_file' is a read only variable
#
SHOW VARIABLES like 'back_log';
Variable_name Value
back_log 50
SELECT @@session.back_log;
ERROR HY000: Variable 'back_log' is a GLOBAL variable
SELECT @@global.back_log;
@@global.back_log
50
SET @@session.back_log= 7;
ERROR HY000: Variable 'back_log' is a read only variable
SET @@global.back_log= 7;
ERROR HY000: Variable 'back_log' is a read only variable
#
SHOW VARIABLES like 'large_files_support';
Variable_name Value
large_files_support #
SELECT @@session.large_files_support;
ERROR HY000: Variable 'large_files_support' is a GLOBAL variable
SELECT @@global.large_files_support;
@@global.large_files_support
#
SET @@session.large_files_support= true;
ERROR HY000: Variable 'large_files_support' is a read only variable
SET @@global.large_files_support= true;
ERROR HY000: Variable 'large_files_support' is a read only variable
#
SHOW VARIABLES like 'character_sets_dir';
Variable_name Value
character_sets_dir #
SELECT @@session.character_sets_dir;
ERROR HY000: Variable 'character_sets_dir' is a GLOBAL variable
SELECT @@global.character_sets_dir;
@@global.character_sets_dir
#
SET @@session.character_sets_dir= 'x';
ERROR HY000: Variable 'character_sets_dir' is a read only variable
SET @@global.character_sets_dir= 'x';
ERROR HY000: Variable 'character_sets_dir' is a read only variable
#
SHOW VARIABLES like 'init_file';
Variable_name Value
init_file #
SELECT @@session.init_file;
ERROR HY000: Variable 'init_file' is a GLOBAL variable
SELECT @@global.init_file;
@@global.init_file
#
SET @@session.init_file= 'x';
ERROR HY000: Variable 'init_file' is a read only variable
SET @@global.init_file= 'x';
ERROR HY000: Variable 'init_file' is a read only variable
#
SHOW VARIABLES like 'lc_messages_dir';
Variable_name Value
lc_messages_dir #
SELECT @@session.lc_messages_dir;
ERROR HY000: Variable 'lc_messages_dir' is a GLOBAL variable
SELECT @@global.lc_messages_dir;
@@global.lc_messages_dir
#
SET @@session.lc_messages_dir= 'x';
ERROR HY000: Variable 'lc_messages_dir' is a read only variable
SET @@global.lc_messages_dir= 'x';
ERROR HY000: Variable 'lc_messages_dir' is a read only variable
#
SHOW VARIABLES like 'large_page_size';
Variable_name Value
large_page_size #
SELECT @@session.large_page_size;
ERROR HY000: Variable 'large_page_size' is a GLOBAL variable
SELECT @@global.large_page_size;
@@global.large_page_size
#
SET @@session.large_page_size= 7;
ERROR HY000: Variable 'large_page_size' is a read only variable
SET @@global.large_page_size= 7;
ERROR HY000: Variable 'large_page_size' is a read only variable
#
SHOW VARIABLES like 'large_pages';
Variable_name Value
large_pages #
SELECT @@session.large_pages;
ERROR HY000: Variable 'large_pages' is a GLOBAL variable
SELECT @@global.large_pages;
@@global.large_pages
#
SET @@session.large_pages= true;
ERROR HY000: Variable 'large_pages' is a read only variable
SET @@global.large_pages= true;
ERROR HY000: Variable 'large_pages' is a read only variable
#
SHOW VARIABLES like 'log_bin';
Variable_name Value
log_bin OFF
SELECT @@session.log_bin;
ERROR HY000: Variable 'log_bin' is a GLOBAL variable
SELECT @@global.log_bin;
@@global.log_bin
0
SET @@session.log_bin= true;
ERROR HY000: Variable 'log_bin' is a read only variable
SET @@global.log_bin= true;
ERROR HY000: Variable 'log_bin' is a read only variable
#
SHOW VARIABLES like 'log_error';
Variable_name Value
log_error #
SELECT @@session.log_error;
ERROR HY000: Variable 'log_error' is a GLOBAL variable
SELECT @@global.log_error;
@@global.log_error
#
SET @@session.log_error= 'x';
ERROR HY000: Variable 'log_error' is a read only variable
SET @@global.log_error= 'x';
ERROR HY000: Variable 'log_error' is a read only variable
#
SHOW VARIABLES like 'lower_case_file_system';
Variable_name Value
lower_case_file_system #
SELECT @@session.lower_case_file_system;
ERROR HY000: Variable 'lower_case_file_system' is a GLOBAL variable
SELECT @@global.lower_case_file_system;
@@global.lower_case_file_system
#
SET @@session.lower_case_file_system= true;
ERROR HY000: Variable 'lower_case_file_system' is a read only variable
SET @@global.lower_case_file_system= true;
ERROR HY000: Variable 'lower_case_file_system' is a read only variable
#
SHOW VARIABLES like 'lower_case_table_names';
Variable_name Value
lower_case_table_names #
SELECT @@session.lower_case_table_names;
ERROR HY000: Variable 'lower_case_table_names' is a GLOBAL variable
SELECT @@global.lower_case_table_names;
@@global.lower_case_table_names
#
SET @@session.lower_case_table_names= 7;
ERROR HY000: Variable 'lower_case_table_names' is a read only variable
SET @@global.lower_case_table_names= 7;
ERROR HY000: Variable 'lower_case_table_names' is a read only variable
#
SHOW VARIABLES like 'myisam_recover_options';
Variable_name Value
myisam_recover_options OFF
SELECT @@session.myisam_recover_options;
ERROR HY000: Variable 'myisam_recover_options' is a GLOBAL variable
SELECT @@global.myisam_recover_options;
@@global.myisam_recover_options
OFF
SET @@session.myisam_recover_options= 'x';
ERROR HY000: Variable 'myisam_recover_options' is a read only variable
SET @@global.myisam_recover_options= 'x';
ERROR HY000: Variable 'myisam_recover_options' is a read only variable
#
SHOW VARIABLES like 'open_files_limit';
Variable_name Value
open_files_limit #
SELECT @@session.open_files_limit;
ERROR HY000: Variable 'open_files_limit' is a GLOBAL variable
SELECT @@global.open_files_limit;
@@global.open_files_limit
#
SET @@session.open_files_limit= 7;
ERROR HY000: Variable 'open_files_limit' is a read only variable
SET @@global.open_files_limit= 7;
ERROR HY000: Variable 'open_files_limit' is a read only variable
#
SHOW VARIABLES like 'pid_file';
Variable_name Value
pid_file #
SELECT @@session.pid_file;
ERROR HY000: Variable 'pid_file' is a GLOBAL variable
SELECT @@global.pid_file;
@@global.pid_file
#
SET @@session.pid_file= 'x';
ERROR HY000: Variable 'pid_file' is a read only variable
SET @@global.pid_file= 'x';
ERROR HY000: Variable 'pid_file' is a read only variable
#
SHOW VARIABLES like 'plugin_dir';
Variable_name Value
plugin_dir #
SELECT @@session.plugin_dir;
ERROR HY000: Variable 'plugin_dir' is a GLOBAL variable
SELECT @@global.plugin_dir;
@@global.plugin_dir
#
SET @@session.plugin_dir= 'x';
ERROR HY000: Variable 'plugin_dir' is a read only variable
SET @@global.plugin_dir= 'x';
ERROR HY000: Variable 'plugin_dir' is a read only variable
#
SHOW VARIABLES like 'port';
Variable_name Value
port #
SELECT @@session.port;
ERROR HY000: Variable 'port' is a GLOBAL variable
SELECT @@global.port;
@@global.port
#
SET @@session.port= 7;
ERROR HY000: Variable 'port' is a read only variable
SET @@global.port= 7;
ERROR HY000: Variable 'port' is a read only variable
#
SHOW VARIABLES like 'protocol_version';
Variable_name Value
protocol_version 10
SELECT @@session.protocol_version;
ERROR HY000: Variable 'protocol_version' is a GLOBAL variable
SELECT @@global.protocol_version;
@@global.protocol_version
10
SET @@session.protocol_version= 7;
ERROR HY000: Variable 'protocol_version' is a read only variable
SET @@global.protocol_version= 7;
ERROR HY000: Variable 'protocol_version' is a read only variable
#
SHOW VARIABLES like 'skip_external_locking';
Variable_name Value
skip_external_locking ON
SELECT @@session.skip_external_locking;
ERROR HY000: Variable 'skip_external_locking' is a GLOBAL variable
SELECT @@global.skip_external_locking;
@@global.skip_external_locking
1
SET @@session.skip_external_locking= true;
ERROR HY000: Variable 'skip_external_locking' is a read only variable
SET @@global.skip_external_locking= true;
ERROR HY000: Variable 'skip_external_locking' is a read only variable
#
SHOW VARIABLES like 'skip_networking';
Variable_name Value
skip_networking OFF
SELECT @@session.skip_networking;
ERROR HY000: Variable 'skip_networking' is a GLOBAL variable
SELECT @@global.skip_networking;
@@global.skip_networking
0
SET @@session.skip_networking= true;
ERROR HY000: Variable 'skip_networking' is a read only variable
SET @@global.skip_networking= true;
ERROR HY000: Variable 'skip_networking' is a read only variable
#
SHOW VARIABLES like 'skip_show_database';
Variable_name Value
skip_show_database OFF
SELECT @@session.skip_show_database;
ERROR HY000: Variable 'skip_show_database' is a GLOBAL variable
SELECT @@global.skip_show_database;
@@global.skip_show_database
0
SET @@session.skip_show_database= true;
ERROR HY000: Variable 'skip_show_database' is a read only variable
SET @@global.skip_show_database= true;
ERROR HY000: Variable 'skip_show_database' is a read only variable
#
SHOW VARIABLES like 'thread_stack';
Variable_name Value
thread_stack #
SELECT @@session.thread_stack;
ERROR HY000: Variable 'thread_stack' is a GLOBAL variable
SELECT @@global.thread_stack;
@@global.thread_stack
#
SET @@session.thread_stack= 7;
ERROR HY000: Variable 'thread_stack' is a read only variable
SET @@global.thread_stack= 7;
ERROR HY000: Variable 'thread_stack' is a read only variable
SELECT @@global.expire_logs_days INTO @old_eld;
SET GLOBAL expire_logs_days = -1;
Warnings:
Warning 1292 Truncated incorrect expire_logs_days value: '-1'
needs to've been adjusted (0)
SELECT @@global.expire_logs_days;
@@global.expire_logs_days
0
SET GLOBAL expire_logs_days = 11;
SET @old_mode=@@sql_mode;
SET SESSION sql_mode = 'TRADITIONAL';
SET GLOBAL expire_logs_days = 100;
ERROR 42000: Variable 'expire_logs_days' can't be set to the value of '100'
needs to be unchanged (11)
SELECT @@global.expire_logs_days;
@@global.expire_logs_days
11
SET SESSION sql_mode = @old_mode;
SET GLOBAL expire_logs_days = 100;
Warnings:
Warning 1292 Truncated incorrect expire_logs_days value: '100'
needs to've been adjusted (99)
SELECT @@global.expire_logs_days;
@@global.expire_logs_days
99
SET GLOBAL expire_logs_days = 11;
SET GLOBAL expire_logs_days = 99;
needs to pass with no warnings (99)
SELECT @@global.expire_logs_days;
@@global.expire_logs_days
99
SET GLOBAL expire_logs_days = @old_eld;
SET GLOBAL auto_increment_offset=-1;
Warnings:
Warning 1292 Truncated incorrect auto_increment_offset value: '-1'
SET GLOBAL auto_increment_offset=0;
Warnings:
Warning 1292 Truncated incorrect auto_increment_offset value: '0'
select @@default_storage_engine;
Catalog Database Table Table_alias Column Column_alias Type Length Max length Is_null Flags Decimals Charsetnr
def @@default_storage_engine 253 6 6 Y 0 31 8
@@default_storage_engine
MyISAM
SET @old_server_id = @@GLOBAL.server_id;
SET GLOBAL server_id = (1 << 32) - 1;
SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
4294967295
SET GLOBAL server_id = (1 << 32);
Warnings:
Warning 1292 Truncated incorrect server_id value: '4294967296'
SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
4294967295
SET GLOBAL server_id = (1 << 60);
Warnings:
Warning 1292 Truncated incorrect server_id value: '1152921504606846976'
SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
4294967295
SET GLOBAL server_id = 0;
SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
0
SET GLOBAL server_id = -1;
Warnings:
Warning 1292 Truncated incorrect server_id value: '-1'
SELECT @@GLOBAL.server_id;
@@GLOBAL.server_id
0
SET GLOBAL server_id = @old_server_id;
SELECT @@GLOBAL.INIT_FILE, @@GLOBAL.INIT_FILE IS NULL;
@@GLOBAL.INIT_FILE @@GLOBAL.INIT_FILE IS NULL
NULL 1
CREATE TABLE t1 (a INT);
INSERT INTO t1 VALUES ();
SET @bug42778= @@sql_safe_updates;
SET @@sql_safe_updates= 0;
DELETE FROM t1 ORDER BY (@@GLOBAL.INIT_FILE) ASC LIMIT 10;
SET @@sql_safe_updates= @bug42778;
DROP TABLE t1;
#
# BUG#10206 - InnoDB: Transaction requiring Max_BinLog_Cache_size > 4GB always rollsback
#
SET @old_max_binlog_cache_size = @@GLOBAL.max_binlog_cache_size;
# Set the max_binlog_cache_size to size more than 4GB.
SET GLOBAL max_binlog_cache_size = 5 * 1024 * 1024 * 1024;
SELECT @@GLOBAL.max_binlog_cache_size;
@@GLOBAL.max_binlog_cache_size
5368709120
SET GLOBAL max_binlog_cache_size = @old_max_binlog_cache_size;
#
# Bug #37168 : Missing variable - skip_name_resolve
#
SELECT @@skip_name_resolve;
@@skip_name_resolve
0
SHOW VARIABLES LIKE 'skip_name_resolve';
Variable_name Value
skip_name_resolve OFF
End of 5.1 tests
#
# Bug#34828: OF is taken as OFF and a value of 0 is set for variable SQL_notes.
#
# Checking sql_notes...
SET @sql_notes_saved = @@sql_notes;
SET @@sql_notes = ON;
SELECT @@sql_notes;
@@sql_notes
1
SET @@sql_notes = OF;
ERROR 42000: Variable 'sql_notes' can't be set to the value of 'OF'
SELECT @@sql_notes;
@@sql_notes
1
SET @@sql_notes = OFF;
SELECT @@sql_notes;
@@sql_notes
0
SET @@sql_notes = @sql_notes_saved;
# Checking delay_key_write...
SET @delay_key_write_saved = @@delay_key_write;
SET GLOBAL delay_key_write = ON;
SELECT @@delay_key_write;
@@delay_key_write
ON
SET GLOBAL delay_key_write = OF;
ERROR 42000: Variable 'delay_key_write' can't be set to the value of 'OF'
SELECT @@delay_key_write;
@@delay_key_write
ON
SET GLOBAL delay_key_write = AL;
ERROR 42000: Variable 'delay_key_write' can't be set to the value of 'AL'
SELECT @@delay_key_write;
@@delay_key_write
ON
SET GLOBAL delay_key_write = OFF;
SELECT @@delay_key_write;
@@delay_key_write
OFF
SET GLOBAL delay_key_write = ALL;
SELECT @@delay_key_write;
@@delay_key_write
ALL
SET GLOBAL delay_key_write = @delay_key_write_saved;
# Checking sql_safe_updates...
SET @sql_safe_updates_saved = @@sql_safe_updates;
SET @@sql_safe_updates = ON;
SELECT @@sql_safe_updates;
@@sql_safe_updates
1
SET @@sql_safe_updates = OF;
ERROR 42000: Variable 'sql_safe_updates' can't be set to the value of 'OF'
SELECT @@sql_safe_updates;
@@sql_safe_updates
1
SET @@sql_safe_updates = OFF;
SELECT @@sql_safe_updates;
@@sql_safe_updates
0
SET @@sql_safe_updates = @sql_safe_updates_saved;
# Checking foreign_key_checks...
SET @foreign_key_checks_saved = @@foreign_key_checks;
SET @@foreign_key_checks = ON;
SELECT @@foreign_key_checks;
@@foreign_key_checks
1
SET @@foreign_key_checks = OF;
ERROR 42000: Variable 'foreign_key_checks' can't be set to the value of 'OF'
SELECT @@foreign_key_checks;
@@foreign_key_checks
1
SET @@foreign_key_checks = OFF;
SELECT @@foreign_key_checks;
@@foreign_key_checks
0
SET @@foreign_key_checks = @foreign_key_checks_saved;
# Checking unique_checks...
SET @unique_checks_saved = @@unique_checks;
SET @@unique_checks = ON;
SELECT @@unique_checks;
@@unique_checks
1
SET @@unique_checks = OF;
ERROR 42000: Variable 'unique_checks' can't be set to the value of 'OF'
SELECT @@unique_checks;
@@unique_checks
1
SET @@unique_checks = OFF;
SELECT @@unique_checks;
@@unique_checks
0
SET @@unique_checks = @unique_checks_saved;
# Checking sql_buffer_result...
SET @sql_buffer_result_saved = @@sql_buffer_result;
SET @@sql_buffer_result = ON;
SELECT @@sql_buffer_result;
@@sql_buffer_result
1
SET @@sql_buffer_result = OF;
ERROR 42000: Variable 'sql_buffer_result' can't be set to the value of 'OF'
SELECT @@sql_buffer_result;
@@sql_buffer_result
1
SET @@sql_buffer_result = OFF;
SELECT @@sql_buffer_result;
@@sql_buffer_result
0
SET @@sql_buffer_result = @sql_buffer_result_saved;
# Checking sql_quote_show_create...
SET @sql_quote_show_create_saved = @@sql_quote_show_create;
SET @@sql_quote_show_create = ON;
SELECT @@sql_quote_show_create;
@@sql_quote_show_create
1
SET @@sql_quote_show_create = OF;
ERROR 42000: Variable 'sql_quote_show_create' can't be set to the value of 'OF'
SELECT @@sql_quote_show_create;
@@sql_quote_show_create
1
SET @@sql_quote_show_create = OFF;
SELECT @@sql_quote_show_create;
@@sql_quote_show_create
0
SET @@sql_quote_show_create = @sql_quote_show_create_saved;
# End of Bug#34828.
# Make sure we can manipulate with autocommit in the
# along with other variables.
drop table if exists t1;
drop function if exists t1_max;
drop function if exists t1_min;
create table t1 (a int) engine=innodb;
insert into t1(a) values (0), (1);
create function t1_max() returns int return (select max(a) from t1);
create function t1_min() returns int return (select min(a) from t1);
select t1_min();
t1_min()
0
select t1_max();
t1_max()
1
set @@session.autocommit=t1_min(), @@session.autocommit=t1_max(),
@@session.autocommit=t1_min(), @@session.autocommit=t1_max(),
@@session.autocommit=t1_min(), @@session.autocommit=t1_max();
# Cleanup.
drop table t1;
drop function t1_min;
drop function t1_max;
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