Have you ever opened an old WordPress post and seen a message at the top of the screen explaining WordPress has saved a newer revision of the post than the one that is published? This is most likely because of the WordPress autosave feature, which automatically saves revisions of posts periodically as you create and edit posts. This is a great idea if you have a staff of several people with the ability to add and revise content on your website. If you are the only person working on the website, though, you may never look at the post revisions at all. Behind the scenes, though, the revision feature is ballooning the size of your Web server’s SQL database and potentially slowing your website down. If you don’t use WordPress post revisions, turn this feature off and delete the saved revisions to keep the size of your SQL database down.
Install and activate plugins by clicking “Add New” in the “Plugins” section of the WordPress dashboard. Search for a plugin using the name given in this article.
Learn more about reducing the size of your WordPress SQL database.