SET @start_global_value = @@global.slave_checkpoint_group;
SELECT @start_global_value;
@start_global_value
512
select @@global.slave_checkpoint_group;
@@global.slave_checkpoint_group
512
select @@session.slave_checkpoint_group;
ERROR HY000: Variable 'slave_checkpoint_group' is a GLOBAL variable
show global variables like 'slave_checkpoint_group';
Variable_name	Value
slave_checkpoint_group	512
show session variables like 'slave_checkpoint_group';
Variable_name	Value
slave_checkpoint_group	512
select * from information_schema.global_variables where variable_name='slave_checkpoint_group';
VARIABLE_NAME	VARIABLE_VALUE
SLAVE_CHECKPOINT_GROUP	512
select * from information_schema.session_variables where variable_name='slave_checkpoint_group';
VARIABLE_NAME	VARIABLE_VALUE
SLAVE_CHECKPOINT_GROUP	512
set global slave_checkpoint_group=1024;
select @@global.slave_checkpoint_group;
@@global.slave_checkpoint_group
1024
set session slave_checkpoint_group=1024;
ERROR HY000: Variable 'slave_checkpoint_group' is a GLOBAL variable and should be set with SET GLOBAL
set global slave_checkpoint_group=1.1;
ERROR 42000: Incorrect argument type to variable 'slave_checkpoint_group'
set global slave_checkpoint_group=1e1;
ERROR 42000: Incorrect argument type to variable 'slave_checkpoint_group'
set global slave_checkpoint_group="foo";
ERROR 42000: Incorrect argument type to variable 'slave_checkpoint_group'
set global slave_checkpoint_group=0;
Warnings:
Warning	1292	Truncated incorrect slave_checkpoint_group value: '0'
set global slave_checkpoint_group=cast(-1 as unsigned int);
Warnings:
Warning	1292	Truncated incorrect slave_checkpoint_group value: '18446744073709551615'
select @@global.slave_checkpoint_group as "truncated to the maximum" ;
truncated to the maximum
524280
SET @@global.slave_checkpoint_group = @start_global_value;
SELECT @@global.slave_checkpoint_group;
@@global.slave_checkpoint_group
512
