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SET @start_innodb_max_capacity = @@global.innodb_io_capacity_max; SELECT @start_innodb_max_capacity; @start_innodb_max_capacity 2000 SET @start_innodb_capacity = @@global.innodb_io_capacity; SELECT @start_innodb_capacity; @start_innodb_capacity 200 Valid value 100 or more select @@global.innodb_io_capacity_max > 99; @@global.innodb_io_capacity_max > 99 1 select @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 2000 select @@session.innodb_io_capacity_max; ERROR HY000: Variable 'innodb_io_capacity_max' is a GLOBAL variable show global variables like 'innodb_io_capacity_max'; Variable_name Value innodb_io_capacity_max 2000 show session variables like 'innodb_io_capacity_max'; Variable_name Value innodb_io_capacity_max 2000 select * from information_schema.global_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 2000 select * from information_schema.session_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 2000 set global innodb_io_capacity_max=@start_innodb_capacity + 1; select @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 201 select * from information_schema.global_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 201 select * from information_schema.session_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 201 set session innodb_io_capacity_max=444; ERROR HY000: Variable 'innodb_io_capacity_max' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_io_capacity_max=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity_max' set global innodb_io_capacity_max=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity_max' set global innodb_io_capacity_max="foo"; ERROR 42000: Incorrect argument type to variable 'innodb_io_capacity_max' set global innodb_io_capacity_max=1000; set global innodb_io_capacity=500; set global innodb_io_capacity_max=400; Warnings: Warning 1210 Setting innodb_io_capacity_max 400 lower than innodb_io_capacity 500. Warning 1210 Setting innodb_io_capacity to 400 select @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 400 select @@global.innodb_io_capacity; @@global.innodb_io_capacity 400 select * from information_schema.global_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 400 select * from information_schema.global_variables where variable_name='innodb_io_capacity'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY 400 set global innodb_io_capacity_max=1000; set global innodb_io_capacity=500; set global innodb_io_capacity=1400; Warnings: Warning 1210 Setting innodb_io_capacity to 1400 higher than innodb_io_capacity_max 1000 Warning 1210 Setting innodb_max_io_capacity to 2800 select @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 2800 select @@global.innodb_io_capacity; @@global.innodb_io_capacity 1400 select * from information_schema.global_variables where variable_name='innodb_io_capacity_max'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY_MAX 2800 select * from information_schema.global_variables where variable_name='innodb_io_capacity'; VARIABLE_NAME VARIABLE_VALUE INNODB_IO_CAPACITY 1400 set global innodb_io_capacity=100; set global innodb_io_capacity_max=100; select @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 100 SET @@global.innodb_io_capacity_max = @start_innodb_max_capacity; SELECT @@global.innodb_io_capacity_max; @@global.innodb_io_capacity_max 2000 SET @@global.innodb_io_capacity = @start_innodb_capacity; SELECT @@global.innodb_io_capacity; @@global.innodb_io_capacity 200