Because WordPress is a database-driven software, the performance of your blog is closely related to the efficiency of your database. The larger and more jumbled your database, the slower your blog’s performance.
If you haven’t been doing regular housekeeping and database maintenance, either because you don’t know how or because you’re just plain lazy, here are 8 easy and quick ways to clean up your WordPress database.
1. Turn off/delete post revision
While the post revision is a good way to make sure that any changes to a post is documented, it can be a waste of database and server resources if you are the only user of the blog and does not collaborate with other authors for article writing.
To prevent the post revision from cluttering your database, it is best to turn it off once and for all.
You can easily turn off post-revision by adding the following line to the “wp_config.php” file.
If you want to keep the post revision for record purpose, you can limit the number of revisions saved per post. In your “wp_config.php” file, add the following line instead:
and replace the “no_of_revision” by the number of revision copy you want to keep.
2. Delete unused images
Everytime you upload an image, WordPress automatically create duplicate copies of that image and resize them to thumbnail and medium size. Most of the time, these images are not used. In addition, there could also be some images that you have uploaded, but did not use them in the post. These unused images could easily add up to a massive size and cause unnecessarily burden to the server and database.
The Media Cleaner plugin scans your WordPress blog and find those images that are not used or referenced to by any of the posts/pages. It then proceeds to delete them from the database/server.
Similarly, you should run this plugin every few months to clean up your database.
3. Optimize database
As you add or remove entries into the database, pocket of spaces are created. These are useless space and could cause your database to swell quickly. You can easily free up these spaces by running a SQL
optimize table query in myphpadmin.
If you are not technically inclined or find it troublesome to log into your myphpadmin, the best way is to use the plugin WP-DBManager to manage your database.
Install and activate the plugin. Under the “Database -> Optimize Database” options, select the table that you want to optimize and click the “Optimize” button to start the optimization. It should take less than a minute.
You can also schedule it to optimize the database every few days/weeks/months
Go to “Database -> Database option”. Scroll down till you see the Automatic Optimizing of DB. Set the frequency for it to auto-optimize your database.
4. Delete unwanted plugin
If you have decided that you have no use for a particular plugin, deactivated them and delete them from your server. The more (unused) plugins you keep in your server, the longer it takes for WordPress to generate the plugin list and the higher tendency that it will slow down the loading time of your blog.
5) Uninstall plugin completely
When you deactivated/uninstall a plugin, the options or the tables that the plugin created are not removed. As you install and uninstall a lot of plugin, there will be more and more orphaned options and tables that are taking up precious space in your database.
For plugins that have created table entries in the database, you can use the abovementioned WP-DBManager to drop the respective table from your database.
For those plugins that have created options, you have to use the Clean Option plugin to hunt down the orphaned options and delete them from the database.
6. Remove unused themes
Similarly, if you have plenty of unused themes in the server, delete those that you don’t use.
7. Check your site for deadlinks
While it is an usual practise to link to other posts/blogs/domains in your articles, you should check frequently that the linked post/domain still exist and you are not left with a dead link. It can be very frustrating for your reader to follow your link only to find that the destination page is no longer around. In addition, too many dead links can also affect your search engine ranking. I am sure this is not something that you want to see.
The broken link checker plugin checks your new article for broken links as soon as it is published. It also scans your old posts when you are logged into the Admin page. Any broken links found are reported to you and you can choose to edit or unlink them from the posts.
8. Delete spam comment
It is common to receive a flood of spam comments, sometimes as soon as the article is published. Even if these spam comments are not displayed on your blog, they are still collected in your database and used to train “intelligent” anti-spam plugins. If you receive a large amount of spam every day (or hour), this could be consuming a significant amount of valuable database space. To remove the spam, go to the “Comment -> Spam” page, select all of the spam comments, and then click the “Delete” button in the dropdown box.
Other features of the WP-Optimize plugin include the ability to delete revisions, optimise database tables, and change your username. Personally I would prefer to use the WP-DBManager to optimize my database table as it allows me to schedule the optimization task on a regular basis. In addition, the WP-Optimize is only tested for WP2.7, so if you are still using a WP version less than 2.7, you have to use it at your own risk.