~drizzle-trunk/drizzle/development

drop table if exists t1,t2;
drop schema if exists data_dictionary;
create schema data_dictionary;
set @my_myisam_key_cache_size           =@@global.myisam_key_cache_size;
set @my_max_connect_errors        =@@global.max_connect_errors;
set @my_max_heap_table_size       =@@global.max_heap_table_size;
set @my_max_join_size             =@@global.max_join_size;
set @my_drizzle_protocol_buffer_length =@@global.drizzle_protocol_buffer_length;
set @my_server_id                 =@@global.server_id;
set @my_storage_engine            =@@global.storage_engine;
set @my_myisam_sort_buffer_size	  =@@global.myisam_sort_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 NOT NULL, c_name VARCHAR(250), c_country VARCHAR(250), 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 data_dictionary.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 data_dictionary.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 data_dictionary.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 data_dictionary.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	2147483647
select * from data_dictionary.global_variables where variable_name like 'max_join_size';
VARIABLE_NAME	VARIABLE_VALUE
max_join_size	2147483647
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 345 AS `@@IDENTITY`,last_insert_id() AS `last_insert_id()`,345 AS `@@identity`
set global timed_mutexes=ON;
show variables like 'timed_mutexes';
Variable_name	Value
timed_mutexes	ON
select * from data_dictionary.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 data_dictionary.session_variables where variable_name like 'timed_mutexes';
VARIABLE_NAME	VARIABLE_VALUE
timed_mutexes	OFF
set storage_engine=MYISAM, storage_engine="MEMORY";
show local variables like 'storage_engine';
Variable_name	Value
storage_engine	MEMORY
select * from data_dictionary.session_variables where variable_name like 'storage_engine';
VARIABLE_NAME	VARIABLE_VALUE
storage_engine	MEMORY
show global variables like 'storage_engine';
Variable_name	Value
storage_engine	InnoDB
select * from data_dictionary.global_variables where variable_name like 'storage_engine';
VARIABLE_NAME	VARIABLE_VALUE
storage_engine	InnoDB
set GLOBAL myisam_max_sort_file_size=2000000;
show global variables like 'myisam_max_sort_file_size';
Variable_name	Value
myisam_max_sort_file_size	2000000
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
VARIABLE_NAME	VARIABLE_VALUE
myisam_max_sort_file_size	2000000
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	2147483647
select * from data_dictionary.global_variables where variable_name like 'myisam_max_sort_file_size';
VARIABLE_NAME	VARIABLE_VALUE
myisam_max_sort_file_size	2147483647
set global drizzle_protocol_buffer_length=1024;
show global variables like 'drizzle_protocol_buffer_%';
Variable_name	Value
drizzle_protocol_buffer_length	1024
select * from data_dictionary.global_variables where variable_name like 'drizzle_protocol_buffer_%';
VARIABLE_NAME	VARIABLE_VALUE
drizzle_protocol_buffer_length	1024
show global variables like 'drizzle_protocol_buffer_%';
Variable_name	Value
drizzle_protocol_buffer_length	1024
select * from data_dictionary.global_variables where variable_name like 'drizzle_protocol_buffer_%';
VARIABLE_NAME	VARIABLE_VALUE
drizzle_protocol_buffer_length	1024
set global drizzle_protocol_buffer_length=1;
Warnings:
Error	1292	Truncated incorrect buffer_length value: '1'
show variables like 'drizzle_protocol_buffer_length';
Variable_name	Value
drizzle_protocol_buffer_length	1024
set global drizzle_protocol_buffer_length=2000000000;
Warnings:
Error	1292	Truncated incorrect buffer_length value: '2000000000'
show variables like 'drizzle_protocol_buffer_length';
Variable_name	Value
drizzle_protocol_buffer_length	1048576
show variables like '%alloc%';
Variable_name	Value
innodb_use_sys_malloc	ON
query_alloc_block_size	8192
query_prealloc_size	8192
range_alloc_block_size	4096
select * from data_dictionary.session_variables where variable_name like '%alloc%';
VARIABLE_NAME	VARIABLE_VALUE
innodb_use_sys_malloc	ON
query_alloc_block_size	8192
query_prealloc_size	8192
range_alloc_block_size	4096
set @@range_alloc_block_size=1024*16;
set @@query_alloc_block_size=1024*17+2;
set @@query_prealloc_size=1024*18;
select @@query_alloc_block_size;
@@query_alloc_block_size
17408
show variables like '%alloc%';
Variable_name	Value
innodb_use_sys_malloc	ON
query_alloc_block_size	17408
query_prealloc_size	18432
range_alloc_block_size	16384
select * from data_dictionary.session_variables where variable_name like '%alloc%';
VARIABLE_NAME	VARIABLE_VALUE
innodb_use_sys_malloc	ON
query_alloc_block_size	17408
query_prealloc_size	18432
range_alloc_block_size	16384
set @@range_alloc_block_size=default;
set @@query_alloc_block_size=default, @@query_prealloc_size=default;
show variables like '%alloc%';
Variable_name	Value
innodb_use_sys_malloc	ON
query_alloc_block_size	8192
query_prealloc_size	8192
range_alloc_block_size	4096
select * from data_dictionary.session_variables where variable_name like '%alloc%';
VARIABLE_NAME	VARIABLE_VALUE
innodb_use_sys_malloc	ON
query_alloc_block_size	8192
query_prealloc_size	8192
range_alloc_block_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 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 storage_engine=UNKNOWN_TABLE_TYPE;
ERROR 42000: Unknown table engine 'UNKNOWN_TABLE_TYPE'
set GLOBAL storage_engine=DEFAULT;
ERROR 42000: Variable 'storage_engine' doesn't have a default value
set global autocommit=1;
ERROR HY000: Variable 'autocommit' is a SESSION variable and can't be used with SET GLOBAL
select @@global.timestamp;
ERROR HY000: Variable 'timestamp' is a SESSION variable
set @@version='';
ERROR HY000: Variable 'version' is a read only variable
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;
select @@autocommit;
@@autocommit
1
set bulk_insert_buffer_size=100;
set join_buffer_size=100;
Warnings:
Error	1292	Truncated incorrect join_buffer_size value: '100'
set last_insert_id=1;
set max_allowed_packet=100;
Warnings:
Error	1292	Truncated incorrect max_allowed_packet value: '100'
set global max_connect_errors=100;
set max_heap_table_size=100;
Warnings:
Error	1292	Truncated incorrect max_heap_table_size value: '100'
set max_join_size=100;
set max_sort_length=100;
set global max_write_lock_count=100;
set global myisam_sort_buffer_size=100;
Warnings:
Error	1292	Truncated incorrect sort_buffer_size value: '100'
set global drizzle_protocol_buffer_length=100;
Warnings:
Error	1292	Truncated incorrect buffer_length value: '100'
set read_buffer_size=100;
Warnings:
Error	1292	Truncated incorrect read_buffer_size value: '100'
set read_rnd_buffer_size=100;
set global server_id=100;
set sort_buffer_size=100;
Warnings:
Error	1292	Truncated incorrect sort_buffer_size value: '100'
set sql_big_selects=1;
set sql_buffer_result=1;
set sql_select_limit=1;
set sql_select_limit=default;
set sql_warnings=1;
set global table_open_cache=100;
set storage_engine=myisam;
set timestamp=1, timestamp=default;
set tmp_table_size=100;
Warnings:
Error	1292	Truncated incorrect tmp_table_size value: '100'
set tx_isolation="READ-COMMITTED";
create temporary table t1 (a int not null auto_increment, primary key(a));
create temporary 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 myisam_key_cache_size=100000;
Warnings:
Error	1292	Truncated incorrect key_cache_size value: '100000'
select @@myisam_key_cache_size;
@@myisam_key_cache_size
1048576
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.myisam_key_cache_size;
ERROR HY000: Variable 'myisam_key_cache_size' is a GLOBAL variable
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 data_dictionary.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;
set @@global.global.myisam_key_cache_size= 1;
ERROR HY000: Unknown system variable 'global'
set GLOBAL global.myisam_key_cache_size= 1;
ERROR HY000: Unknown system variable 'global'
SELECT @@global.global.myisam_key_cache_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'myisam_key_cache_size' at line 1
SELECT @@global.session.myisam_key_cache_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'myisam_key_cache_size' at line 1
SELECT @@global.local.myisam_key_cache_size;
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle server version for the right syntax to use near 'myisam_key_cache_size' at line 1
create temporary table t1 (
c1 int,
c2 int,
c3 int,
c4 int,
c5 bigint);
show create table t1;
Table	Create Table
t1	CREATE TEMPORARY TABLE `t1` (
  `c1` int DEFAULT NULL,
  `c2` int DEFAULT NULL,
  `c3` int DEFAULT NULL,
  `c4` int DEFAULT NULL,
  `c5` bigint DEFAULT NULL
) ENGINE=MyISAM
drop table t1;
set @arg00= 8, @arg01= 8.8, @arg02= 'a string', @arg03= 0.2e0;
create temporary 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 TEMPORARY TABLE `t1` (
  `c1` bigint DEFAULT NULL,
  `c2` decimal(65,30) DEFAULT NULL,
  `c3` text,
  `c4` double DEFAULT NULL
) ENGINE=MyISAM
drop table t1;
SET GLOBAL table_open_cache=-1;
Warnings:
Error	1292	Truncated incorrect table_open_cache value: '18446744073709551615'
SHOW VARIABLES LIKE 'table_open_cache';
Variable_name	Value
table_open_cache	100
SELECT * FROM DATA_DICTIONARY.SESSION_VARIABLES WHERE VARIABLE_NAME LIKE 'table_open_cache';
VARIABLE_NAME	VARIABLE_VALUE
table_open_cache	100
SET GLOBAL table_open_cache=DEFAULT;
*** 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=108;
select @@lc_time_names;
@@lc_time_names
zh_HK
LC_TIME_NAMES: testing a number beyond the valid ID range:
set lc_time_names=109;
ERROR HY000: Unknown locale: '109'
select @@lc_time_names;
@@lc_time_names
zh_HK
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
End of 4.1 tests
create temporary 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
select @@character_set_system;
ERROR HY000: Unknown system variable 'character_set_system'
set global character_set_system = utf8;
ERROR HY000: Unknown system variable 'character_set_system'
set @@global.version_compile_os='234';
ERROR HY000: Variable 'version_compile_os' is a read only variable
set @@global.character_set_filesystem=utf8;
ERROR HY000: Unknown system variable 'character_set_filesystem'
set character_set_filesystem=utf8;
ERROR HY000: Unknown system variable 'character_set_filesystem'
set @sql_big_selects = @@sql_big_selects;
set @@sql_big_selects = 1;
show variables like 'sql_big_selects';
Variable_name	Value
sql_big_selects	ON
set @@sql_big_selects = @sql_big_selects;
set @@sql_notes = 0, @@sql_warnings = 0;
show variables like 'sql_notes';
Variable_name	Value
sql_notes	OFF
show variables like 'sql_warnings';
Variable_name	Value
sql_warnings	OFF
set @@sql_notes = 1, @@sql_warnings = 1;
show variables like 'sql_notes';
Variable_name	Value
sql_notes	ON
show variables like 'sql_warnings';
Variable_name	Value
sql_warnings	ON
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	#
show variables like 'datadir';
Variable_name	Value
datadir	#
show variables like 'tmpdir';
Variable_name	Value
tmpdir	#
select @@"";
ERROR 42000: You have an error in your SQL syntax; check the manual that corresponds to your Drizzle 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 Drizzle 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 Drizzle 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	#
End of 5.0 tests
set global flush_time                =@my_flush_time;
ERROR HY000: Unknown system variable 'flush_time'
set global myisam_key_cache_size           =@my_myisam_key_cache_size;
set global max_connect_errors        =@my_max_connect_errors;
set global max_heap_table_size       =@my_max_heap_table_size;
set global max_join_size             =@my_max_join_size;
set global max_write_lock_count      =default;
set global myisam_data_pointer_size  =@my_myisam_data_pointer_size;
ERROR 42000: Incorrect argument type to variable 'myisam_data_pointer_size'
set global drizzle_protocol_buffer_length= @my_drizzle_protocol_buffer_length;
set global server_id                 =@my_server_id;
set global storage_engine            =@my_storage_engine;
set global thread_cache_size         =@my_thread_cache_size;
ERROR HY000: Unknown system variable 'thread_cache_size'
set global myisam_sort_buffer_size   =@my_myisam_sort_buffer_size;
show global variables where variable_name='table_definition_cache' or Variable_name='table_lock_wait_timeout';
Variable_name	Value
table_definition_cache	#
table_lock_wait_timeout	#
drop schema data_dictionary;