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;
