SET @start_global_value = @@global.profiling_history_size;
SELECT @start_global_value;
@start_global_value
15
select @@global.profiling_history_size;
@@global.profiling_history_size
15
select @@session.profiling_history_size;
@@session.profiling_history_size
15
show global variables like 'profiling_history_size';
Variable_name	Value
profiling_history_size	15
show session variables like 'profiling_history_size';
Variable_name	Value
profiling_history_size	15
select * from information_schema.global_variables where variable_name='profiling_history_size';
VARIABLE_NAME	VARIABLE_VALUE
PROFILING_HISTORY_SIZE	15
select * from information_schema.session_variables where variable_name='profiling_history_size';
VARIABLE_NAME	VARIABLE_VALUE
PROFILING_HISTORY_SIZE	15
set global profiling_history_size=10;
set session profiling_history_size=20;
select @@global.profiling_history_size;
@@global.profiling_history_size
10
select @@session.profiling_history_size;
@@session.profiling_history_size
20
show global variables like 'profiling_history_size';
Variable_name	Value
profiling_history_size	10
show session variables like 'profiling_history_size';
Variable_name	Value
profiling_history_size	20
select * from information_schema.global_variables where variable_name='profiling_history_size';
VARIABLE_NAME	VARIABLE_VALUE
PROFILING_HISTORY_SIZE	10
select * from information_schema.session_variables where variable_name='profiling_history_size';
VARIABLE_NAME	VARIABLE_VALUE
PROFILING_HISTORY_SIZE	20
set global profiling_history_size=1.1;
ERROR 42000: Incorrect argument type to variable 'profiling_history_size'
set global profiling_history_size=1e1;
ERROR 42000: Incorrect argument type to variable 'profiling_history_size'
set global profiling_history_size="foo";
ERROR 42000: Incorrect argument type to variable 'profiling_history_size'
set session profiling_history_size=0;
select @@profiling_history_size;
@@profiling_history_size
0
set session profiling_history_size=101;
Warnings:
Warning	1292	Truncated incorrect profiling_history_size value: '101'
select @@profiling_history_size;
@@profiling_history_size
100
SET @@global.profiling_history_size = @start_global_value;
SELECT @@global.profiling_history_size;
@@global.profiling_history_size
15