If your WordPress blog has been around for awhile, chances are there is some clutter in your MySQL database. For these situations, Joost De Valk of Yoast.com has an easy to use WordPress plugin called Optimize Database.
This free WordPress plugin simply needs activated, then whenever you click Optimize Now, the plugin runs an optimize table command on your WordPress tables, effectively defragmenting it. This is very useful for tables that are frequently updated. If you’d like to learn more about why this WordPress plugin might be necessary, you can read more information on this post.
Great plugin Joost!
Kyle Eslick
Kyle Eslick is WordPress enthusiast who took his passion for WordPress to the next level in 2007 by launching WPHacks.com as a place to share hacks, tutorials, etc. Connect with Kyle on Twitter or Google+!
thank you very good http://www.ispartacicek.net 
I tried it, but the recent updates have given me errors like this one:
Google+ Comments for WordPress requires PHP ...
I want to learn more and more about WordPress development stuff, glad to know about this.. 
I agree with all of them! :) 
Thanks Lior.
http://www.shoppingspout.com
This is really a fantastic post for backing up wordpress. 
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