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SELECT @@global.optimizer_trace_offset;
@@global.optimizer_trace_offset
-1
SET @@global.optimizer_trace_offset=5;
show global variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset 5
select * from information_schema.global_variables where variable_name='optimizer_trace_offset';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_TRACE_OFFSET 5
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
-1
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset -1
select * from information_schema.session_variables where variable_name='optimizer_trace_offset';
VARIABLE_NAME VARIABLE_VALUE
OPTIMIZER_TRACE_OFFSET -1
set session optimizer_trace_offset=10;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
10
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset 10
set session optimizer_trace_offset=0;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
0
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset 0
set session optimizer_trace_offset=-100;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
-100
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset -100
set session optimizer_trace_offset=2000000000;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
2000000000
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset 2000000000
set session optimizer_trace_offset=-2000000000;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
-2000000000
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset -2000000000
set session optimizer_trace_offset=default;
select @@session.optimizer_trace_offset;
@@session.optimizer_trace_offset
5
show session variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset 5
set global optimizer_trace_offset=default;
select @@global.optimizer_trace_offset;
@@global.optimizer_trace_offset
-1
show global variables like 'optimizer_trace_offset';
Variable_name Value
optimizer_trace_offset -1
set optimizer_trace_offset=1.1;
ERROR 42000: Incorrect argument type to variable 'optimizer_trace_offset'
set optimizer_trace_offset="foobar";
ERROR 42000: Incorrect argument type to variable 'optimizer_trace_offset'
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