1SELECT @@GLOBAL.innodb_undo_tablespaces >= 0; 2@@GLOBAL.innodb_undo_tablespaces >= 0 31 4SET @@GLOBAL.innodb_undo_tablespaces=128; 5ERROR HY000: Variable 'innodb_undo_tablespaces' is a read only variable 6Expected error 'Read only variable' 7SELECT COUNT(@@GLOBAL.innodb_undo_tablespaces); 8COUNT(@@GLOBAL.innodb_undo_tablespaces) 91 101 Expected 11DIFFERENCE 120 130 Expected 14SELECT @@innodb_undo_tablespaces = @@GLOBAL.innodb_undo_tablespaces; 15@@innodb_undo_tablespaces = @@GLOBAL.innodb_undo_tablespaces 161 171 Expected 18SELECT COUNT(@@innodb_undo_tablespaces); 19COUNT(@@innodb_undo_tablespaces) 201 211 Expected 22SELECT COUNT(@@local.innodb_undo_tablespaces); 23ERROR HY000: Variable 'innodb_undo_tablespaces' is a GLOBAL variable 24Expected error 'Variable is a GLOBAL variable' 25SELECT COUNT(@@SESSION.innodb_undo_tablespaces); 26ERROR HY000: Variable 'innodb_undo_tablespaces' is a GLOBAL variable 27Expected error 'Variable is a GLOBAL variable' 28SELECT COUNT(@@GLOBAL.innodb_undo_tablespaces); 29COUNT(@@GLOBAL.innodb_undo_tablespaces) 301 311 Expected 32SELECT innodb_undo_tablespaces = @@SESSION.innodb_undo_tablespaces; 33ERROR 42S22: Unknown column 'innodb_undo_tablespaces' in 'field list' 34Expected error 'Readonly variable' 35