You only be repairing tables when an error message tells you to do. Otherwise you risk creating more problems if you do it to a normal, functioning table.
Quote:
MySQL error code 145: Table was marked as crashed and should be repaired
These error codes all have the same solution. They specify that something has gone wrong with your data. You should run optimize & repair on your database tables. You can upload the tools.php file from the vbulletin .zip file do_not_upload/ folder into your forumdir/admincp/ directory and run it through the browser, there's a switch there to run optimize and repair. Run it a few times for best result.
For more information on repairing your database please view the MySQL documentation at:
http://dev.mysql.com/doc/refman/5.0/en/repair.html
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Common MySQL Error Messages