1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
|
#
# 2010-01-20 OBN - Added check of I_S values after variable value change
#
SET @start_global_value = @@global.thread_cache_size;
SELECT @start_global_value;
#
# exists as global only
#
select @@global.thread_cache_size;
--error ER_INCORRECT_GLOBAL_LOCAL_VAR
select @@session.thread_cache_size;
show global variables like 'thread_cache_size';
show session variables like 'thread_cache_size';
select * from information_schema.global_variables where variable_name='thread_cache_size';
select * from information_schema.session_variables where variable_name='thread_cache_size';
#
# show that it's writable
#
set global thread_cache_size=1;
select @@global.thread_cache_size;
select * from information_schema.global_variables where variable_name='thread_cache_size';
select * from information_schema.session_variables where variable_name='thread_cache_size';
--error ER_GLOBAL_VARIABLE
set session thread_cache_size=1;
#
# incorrect types
#
--error ER_WRONG_TYPE_FOR_VAR
set global thread_cache_size=1.1;
--error ER_WRONG_TYPE_FOR_VAR
set global thread_cache_size=1e1;
--error ER_WRONG_TYPE_FOR_VAR
set global thread_cache_size="foo";
#
# min/max values
#
set global thread_cache_size=0;
select @@global.thread_cache_size;
set global thread_cache_size=cast(-1 as unsigned int);
select @@global.thread_cache_size;
SET @@global.thread_cache_size = @start_global_value;
SELECT @@global.thread_cache_size;
|
