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Transients are the result of a form of caching that can happen in the WordPress database with the results of remote API calls. If displaying these external links is not important to you, press this button to clear them from the database. Some WordPress themes display these in the comments section. When other blogs link to you, it can create trackbacks or pingbacks. This option permanently deletes any comments that have been placed in the Trash. There should be no need to keep comments that have been marked as spam. This option permanently deletes any posts or pages that have been placed in the Trash. If you know that all of your posts are either published or saved correctly as drafts, then it is safe to remove the automatic drafts. This is to protect you in case you unexpectedly lose your connection, or your computer crashes. When you edit a post, WordPress automatically saves drafts now and then. Only the currently-published version of each post will be saved. You will sacrifice your ability to go into any of your post and restore previous versions of them. Removes all old post revisions from the database. It executes all of the listed clean-ups, except for Optimize Tables and Clean CSS/JS Optimizer.
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Press this button to clean up everything at once. If you see a red cross, that is your opportunity to do some optimization. The check-marks indicate that the area has already been cleaned-up.
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As your site grows, you add posts and pages, users accounts - your WordPress database will also grow - containing previous versions of posts and pages as well as other 'transient' data.