SET @start_global_value = @@global.innodb_spin_wait_delay;
SELECT @start_global_value;
@start_global_value
6
Valid values are zero or above
select @@global.innodb_spin_wait_delay >=0;
@@global.innodb_spin_wait_delay >=0
1
select @@global.innodb_spin_wait_delay;
@@global.innodb_spin_wait_delay
6
select @@session.innodb_spin_wait_delay;
ERROR HY000: Variable 'innodb_spin_wait_delay' is a GLOBAL variable
show global variables like 'innodb_spin_wait_delay';
Variable_name	Value
innodb_spin_wait_delay	6
show session variables like 'innodb_spin_wait_delay';
Variable_name	Value
innodb_spin_wait_delay	6
select * from information_schema.global_variables where variable_name='innodb_spin_wait_delay';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_SPIN_WAIT_DELAY	6
select * from information_schema.session_variables where variable_name='innodb_spin_wait_delay';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_SPIN_WAIT_DELAY	6
set global innodb_spin_wait_delay=10;
select @@global.innodb_spin_wait_delay;
@@global.innodb_spin_wait_delay
10
select * from information_schema.global_variables where variable_name='innodb_spin_wait_delay';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_SPIN_WAIT_DELAY	10
select * from information_schema.session_variables where variable_name='innodb_spin_wait_delay';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_SPIN_WAIT_DELAY	10
set session innodb_spin_wait_delay=1;
ERROR HY000: Variable 'innodb_spin_wait_delay' is a GLOBAL variable and should be set with SET GLOBAL
set global innodb_spin_wait_delay=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_spin_wait_delay'
set global innodb_spin_wait_delay=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_spin_wait_delay'
set global innodb_spin_wait_delay="foo";
ERROR 42000: Incorrect argument type to variable 'innodb_spin_wait_delay'
set global innodb_spin_wait_delay=-7;
Warnings:
Warning	1292	Truncated incorrect innodb_spin_wait_delay value: '-7'
select @@global.innodb_spin_wait_delay;
@@global.innodb_spin_wait_delay
0
select * from information_schema.global_variables where variable_name='innodb_spin_wait_delay';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_SPIN_WAIT_DELAY	0
SET @@global.innodb_spin_wait_delay = @start_global_value;
SELECT @@global.innodb_spin_wait_delay;
@@global.innodb_spin_wait_delay
6
