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In WordPress 2.9, WordPress gave us a new automatic database repair feature. This feature enables you to repair and optimize your database. You should use this feature time to time to take care of your website's home.You can use this feature even when you're not logged in to your website. This is because its main intent is to repair a corrupted database, Users can often not login to their WordPress when the database is corrupt.
Just add following snippet to your wp-config.php file to activate this feature:
define( 'WP_ALLOW_REPAIR', true );
Once activated, you can see the settings on this page: http://www.yoursite.com/wp-admin/maint/repair.php
Once you are done repairing and optimizing your database, make sure to remove this from your wp-config.php.
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