select @@global.locked_in_memory; @@global.locked_in_memory 0 select @@session.locked_in_memory; ERROR HY000: Variable 'locked_in_memory' is a GLOBAL variable show global variables like 'locked_in_memory'; Variable_name Value locked_in_memory OFF show session variables like 'locked_in_memory'; Variable_name Value locked_in_memory OFF select * from information_schema.global_variables where variable_name='locked_in_memory'; VARIABLE_NAME VARIABLE_VALUE LOCKED_IN_MEMORY OFF select * from information_schema.session_variables where variable_name='locked_in_memory'; VARIABLE_NAME VARIABLE_VALUE LOCKED_IN_MEMORY OFF set global locked_in_memory=1; ERROR HY000: Variable 'locked_in_memory' is a read only variable set session locked_in_memory=1; ERROR HY000: Variable 'locked_in_memory' is a read only variable