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
|
SELECT @@global.optimizer_trace_limit;
@@global.optimizer_trace_limit
1
SET @@global.optimizer_trace_limit=5;
show global variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 5
select * from information_schema.global_variables where variable_name='optimizer_trace_limit';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_TRACE_LIMIT 5
select @@session.optimizer_trace_limit;
@@session.optimizer_trace_limit
1
show session variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 1
select * from information_schema.session_variables where variable_name='optimizer_trace_limit';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_TRACE_LIMIT 1
set session optimizer_trace_limit=10;
select @@session.optimizer_trace_limit;
@@session.optimizer_trace_limit
10
show session variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 10
set session optimizer_trace_limit=0;
select @@session.optimizer_trace_limit;
@@session.optimizer_trace_limit
0
show session variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 0
set session optimizer_trace_limit=-100;
Warnings:
Warning 1292 Truncated incorrect optimizer_trace_limit value: '-100'
select @@session.optimizer_trace_limit;
@@session.optimizer_trace_limit
0
show session variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 0
set session optimizer_trace_limit=default;
select @@session.optimizer_trace_limit;
@@session.optimizer_trace_limit
5
show session variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 5
set global optimizer_trace_limit=default;
select @@global.optimizer_trace_limit;
@@global.optimizer_trace_limit
1
show global variables like 'optimizer_trace_limit';
Variable_name Value
optimizer_trace_limit 1
set optimizer_trace_limit=1.1;
ERROR 42000: Incorrect argument type to variable 'optimizer_trace_limit'
set optimizer_trace_limit="foobar";
ERROR 42000: Incorrect argument type to variable 'optimizer_trace_limit'
|
