SET NDB_EXTRA_LOGGING=1; ERROR HY000: Variable 'ndb_extra_logging' is a GLOBAL variable and should be set with SET GLOBAL SET @SAVE_NDB_EXTRA_LOGGING= @@NDB_EXTRA_LOGGING; SET GLOBAL NDB_EXTRA_LOGGING=1; SHOW VARIABLES LIKE 'ndb_extra_logging'; Variable_name Value ndb_extra_logging 1 SET GLOBAL NDB_EXTRA_LOGGING=0; SHOW VARIABLES LIKE 'ndb_extra_logging'; Variable_name Value ndb_extra_logging 0 SET @@GLOBAL.NDB_EXTRA_LOGGING= @SAVE_NDB_EXTRA_LOGGING;