SET @start_global_value = @@global.innodb_io_capacity;
SELECT @start_global_value;
@start_global_value
200
Valid value 100 or more
select @@global.innodb_io_capacity > 99;
@@global.innodb_io_capacity > 99
1
select @@global.innodb_io_capacity;
@@global.innodb_io_capacity
200
select @@session.innodb_io_capacity;
ERROR HY000: Variable 'innodb_io_capacity' is a GLOBAL variable
show global variables like 'innodb_io_capacity';
Variable_name	Value
innodb_io_capacity	200
show session variables like 'innodb_io_capacity';
Variable_name	Value
innodb_io_capacity	200
select * from information_schema.global_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	200
select * from information_schema.session_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	200
set global innodb_io_capacity=123;
select @@global.innodb_io_capacity;
@@global.innodb_io_capacity
123
select * from information_schema.global_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	123
select * from information_schema.session_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	123
set session innodb_io_capacity=444;
ERROR HY000: Variable 'innodb_io_capacity' is a GLOBAL variable and should be set with SET GLOBAL
set global innodb_io_capacity=1.1;
ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity'
set global innodb_io_capacity=1e1;
ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity'
set global innodb_io_capacity="foo";
ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity'
set global innodb_io_capacity=7;
Warnings:
Warning	1292	Truncated incorrect innodb_io_capacity value: '7'
select @@global.innodb_io_capacity;
@@global.innodb_io_capacity
100
select * from information_schema.global_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	100
set global innodb_io_capacity=-7;
Warnings:
Warning	1292	Truncated incorrect innodb_io_capacity value: '-7'
select @@global.innodb_io_capacity;
@@global.innodb_io_capacity
100
select * from information_schema.global_variables where variable_name='innodb_io_capacity';
VARIABLE_NAME	VARIABLE_VALUE
INNODB_IO_CAPACITY	100
set global innodb_io_capacity=100;
select @@global.innodb_io_capacity;
@@global.innodb_io_capacity
100
SET @@global.innodb_io_capacity = @start_global_value;
SELECT @@global.innodb_io_capacity;
@@global.innodb_io_capacity
200