Repair database

That’s a new feature in 2.9.1 but I never got that message and you are not obliged to use the feature.
If you want it you need to copy and paste the line into wp-config.php on it’s own empty line below db_collate

Make sure not to leave empty lines at the end of the file after the closing ?>

I’ve always used Lesterchan’s DBManager plugin – easy to setup a set schedule for repairing, optimising, backingup a database.

https://www.ads-software.com/extend/plugins/wp-dbmanager/

So I just downloaded the DBManager.. what do I need to do now? Or will it fix itself?

@foodsof1: DB Manager is a plugin that helps you maintain your database which you can use instead of the built-in repair function.

I never received the message either (with 2.9.1) although if it is still showing up for you, please add define('WP_ALLOW_REPAIR', true); to your wp-config.php as suggested by henkholland.

If you want to disable it, you can just take the line out.

p/s: You can read more about this particular functionality at https://codex.www.ads-software.com/Editing_wp-config.php#Automatic_Database_Optimizing