Hello day before yesterday I updated my MySQL Server 5.5.34 to MariaDB 5.5.34 on my Ubuntu 12.04 Server. All went fine but next day, I noticed that the automatic backup script (automysqlbackup) had errors, I read: mysqldump: Couldn't execute 'SELECT /*!40001 SQL_NO_CACHE */ * FROM `EVENTS`': Cannot proceed because system tables used by Event Scheduler were found damaged at server start (1577) mysqldump: Couldn't execute 'show events': Cannot proceed because system tables used by Event Scheduler were found damaged at server start (1577) I searched about it and found the hint to do the command mysql_upgrade (I needed the option --force) and restart the server. This didn't help, no change. When I manually select * from EVENTS from information_schema I get the same error 1577. When I upgraded I made a backup before, so could I just overwrite the existing information_schema with the dump from my backup? Could I destroy something? Thank you. frank