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
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
|
SET @start_global_value = @@global.optimizer_switch;
SELECT @start_global_value;
@start_global_value
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
select @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
select @@session.optimizer_switch;
@@session.optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
show global variables like 'optimizer_switch';
Variable_name Value
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
show session variables like 'optimizer_switch';
Variable_name Value
optimizer_switch index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
select * from information_schema.global_variables where variable_name='optimizer_switch';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_SWITCH index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
select * from information_schema.session_variables where variable_name='optimizer_switch';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_SWITCH index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
set global optimizer_switch=10;
set session optimizer_switch=5;
select @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=off,index_merge_union=on,index_merge_sort_union=off,index_merge_intersection=on,engine_condition_pushdown=off
select @@session.optimizer_switch;
@@session.optimizer_switch
index_merge=on,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,engine_condition_pushdown=off
set global optimizer_switch="index_merge_sort_union=on";
set session optimizer_switch="index_merge=off";
select @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=off
select @@session.optimizer_switch;
@@session.optimizer_switch
index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,engine_condition_pushdown=off
show global variables like 'optimizer_switch';
Variable_name Value
optimizer_switch index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=off
show session variables like 'optimizer_switch';
Variable_name Value
optimizer_switch index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,engine_condition_pushdown=off
select * from information_schema.global_variables where variable_name='optimizer_switch';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_SWITCH index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=off
select * from information_schema.session_variables where variable_name='optimizer_switch';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_SWITCH index_merge=off,index_merge_union=off,index_merge_sort_union=on,index_merge_intersection=off,engine_condition_pushdown=off
set session optimizer_switch="default";
select @@session.optimizer_switch;
@@session.optimizer_switch
index_merge=off,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=off
set global optimizer_switch=1.1;
ERROR 42000: Incorrect argument type to variable 'optimizer_switch'
set global optimizer_switch=1e1;
ERROR 42000: Incorrect argument type to variable 'optimizer_switch'
set session optimizer_switch="index_merge";
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'index_merge'
set session optimizer_switch="foobar";
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'foobar'
#
# Bug#59894 set optimizer_switch to e or d causes invalid
# memory writes/valgrind warnings
set global optimizer_switch = 'd';
set global optimizer_switch = 'e';
ERROR 42000: Variable 'optimizer_switch' can't be set to the value of 'e'
SET @@global.optimizer_switch = @start_global_value;
SELECT @@global.optimizer_switch;
@@global.optimizer_switch
index_merge=on,index_merge_union=on,index_merge_sort_union=on,index_merge_intersection=on,engine_condition_pushdown=on
|
