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SELECT @@GLOBAL.innodb_undo_tablespaces >= 0; @@GLOBAL.innodb_undo_tablespaces >= 0 1 SET @@GLOBAL.innodb_undo_tablespaces=128; ERROR HY000: Variable 'innodb_undo_tablespaces' is a read only variable Expected error 'Read only variable' SELECT COUNT(@@GLOBAL.innodb_undo_tablespaces); COUNT(@@GLOBAL.innodb_undo_tablespaces) 1 1 Expected DIFFERENCE 0 0 Expected SELECT @@innodb_undo_tablespaces = @@GLOBAL.innodb_undo_tablespaces; @@innodb_undo_tablespaces = @@GLOBAL.innodb_undo_tablespaces 1 1 Expected SELECT COUNT(@@innodb_undo_tablespaces); COUNT(@@innodb_undo_tablespaces) 1 1 Expected SELECT COUNT(@@local.innodb_undo_tablespaces); ERROR HY000: Variable 'innodb_undo_tablespaces' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@SESSION.innodb_undo_tablespaces); ERROR HY000: Variable 'innodb_undo_tablespaces' is a GLOBAL variable Expected error 'Variable is a GLOBAL variable' SELECT COUNT(@@GLOBAL.innodb_undo_tablespaces); COUNT(@@GLOBAL.innodb_undo_tablespaces) 1 1 Expected SELECT innodb_undo_tablespaces = @@SESSION.innodb_undo_tablespaces; ERROR 42S22: Unknown column 'innodb_undo_tablespaces' in 'SELECT' Expected error 'Readonly variable'