Valid values are 'ON' and 'OFF' select @@global.innodb_adaptive_flushing in (0, 1); @@global.innodb_adaptive_flushing in (0, 1) 1 select @@global.innodb_use_sys_malloc; @@global.innodb_use_sys_malloc 1 select @@session.innodb_use_sys_malloc; ERROR HY000: Variable 'innodb_use_sys_malloc' is a GLOBAL variable show global variables like 'innodb_use_sys_malloc'; Variable_name Value innodb_use_sys_malloc ON show session variables like 'innodb_use_sys_malloc'; Variable_name Value innodb_use_sys_malloc ON select * from information_schema.global_variables where variable_name='innodb_use_sys_malloc'; VARIABLE_NAME VARIABLE_VALUE INNODB_USE_SYS_MALLOC ON select * from information_schema.session_variables where variable_name='innodb_use_sys_malloc'; VARIABLE_NAME VARIABLE_VALUE INNODB_USE_SYS_MALLOC ON set global innodb_use_sys_malloc=1; ERROR HY000: Variable 'innodb_use_sys_malloc' is a read only variable set session innodb_use_sys_malloc=1; ERROR HY000: Variable 'innodb_use_sys_malloc' is a read only variable