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SET @start_global_value = @@global.innodb_flush_sync; SELECT @start_global_value; @start_global_value 1 Valid values are 'ON' and 'OFF' select @@global.innodb_flush_sync in (0, 1); @@global.innodb_flush_sync in (0, 1) 1 select @@global.innodb_flush_sync; @@global.innodb_flush_sync 1 select @@session.innodb_flush_sync; ERROR HY000: Variable 'innodb_flush_sync' is a GLOBAL variable show global variables like 'innodb_flush_sync'; Variable_name Value innodb_flush_sync ON show session variables like 'innodb_flush_sync'; Variable_name Value innodb_flush_sync ON select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON set global innodb_flush_sync='OFF'; select @@global.innodb_flush_sync; @@global.innodb_flush_sync 0 select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC OFF select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC OFF set @@global.innodb_flush_sync=1; select @@global.innodb_flush_sync; @@global.innodb_flush_sync 1 select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON set global innodb_flush_sync=0; select @@global.innodb_flush_sync; @@global.innodb_flush_sync 0 select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC OFF select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC OFF set @@global.innodb_flush_sync='ON'; select @@global.innodb_flush_sync; @@global.innodb_flush_sync 1 select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON set session innodb_flush_sync='OFF'; ERROR HY000: Variable 'innodb_flush_sync' is a GLOBAL variable and should be set with SET GLOBAL set @@session.innodb_flush_sync='ON'; ERROR HY000: Variable 'innodb_flush_sync' is a GLOBAL variable and should be set with SET GLOBAL set global innodb_flush_sync=1.1; ERROR 42000: Incorrect argument type to variable 'innodb_flush_sync' set global innodb_flush_sync=1e1; ERROR 42000: Incorrect argument type to variable 'innodb_flush_sync' set global innodb_flush_sync=2; ERROR 42000: Variable 'innodb_flush_sync' can't be set to the value of '2' set global innodb_flush_sync=-3; ERROR 42000: Variable 'innodb_flush_sync' can't be set to the value of '-3' select @@global.innodb_flush_sync; @@global.innodb_flush_sync 1 select * from information_schema.global_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON select * from information_schema.session_variables where variable_name='innodb_flush_sync'; VARIABLE_NAME VARIABLE_VALUE INNODB_FLUSH_SYNC ON set global innodb_flush_sync='AUTO'; ERROR 42000: Variable 'innodb_flush_sync' can't be set to the value of 'AUTO' SET @@global.innodb_flush_sync = @start_global_value; SELECT @@global.innodb_flush_sync; @@global.innodb_flush_sync 1