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Database select error its my problem and when I restart my mysql to fix this error this problem solve but after 30 minutes or after hours again this error happen again.

I put link here screenshot from ssh [putty] of errors what should i do? for what reason this happen?

tail -f /var/log/mysqld.log
120813 17:33:57 InnoDB: Completed initialization of buffer pool
120813 17:33:57 InnoDB: highest supported file format is Barracuda.
120813 17:33:57  InnoDB: Waiting for the background threads to start
120813 17:33:58 InnoDB: 1.1.8 started; log sequence number 63473783633
120813 17:33:58 [ERROR] Column count of mysql.db is wrong. Expected 22, found 20. Created with MySQL 50092, now running 50516. Please use mysql_upgrade to fix this error.
120813 17:33:58 [ERROR] mysql.user has no `Event_priv` column at position 29
120813 17:33:58 [ERROR] Event Scheduler: An error occurred when initializing system tables. Disabling the Event Scheduler.
120813 17:33:58 [Note] /usr/libexec/mysqld: ready for connections.
Version: '5.5.16'  socket: '/var/lib/mysql/mysql.sock'  port: 3306  MySQL Community Server (GPL) by Remi
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up vote 0 down vote accepted
  1. reinstall your mysql but idont recommend use mysql_upgrade
  2. check user table in mysql db it seems it has missing column or row
  3. Repair Corrupted Databases use mysqlcheck -rA -u root -p
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reinstall was best way for me .....tanx for your answer – user1574533 Aug 21 '12 at 11:00

Run mysqlcheck, see here --

Also, check if your RAM/disks have no issues. Also, upgrade to the latest release of whatever version of MySQL you are running.

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If you have recently upgraded mysql, you may be missing some columns in the system tables or something just didn't upgrade correctly. take a look at mysql_upgrade. earlier versions of mysql, you'd have to use mysql_fix_privilege_tables. it was removed in 5.5 i believe.

don't forget to back up you database(s) before you do anything in your db.

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