How to Take Control of Page and Post Revisions in WordPress

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WordPress provides a revisions system which records a full copy of every page and post when it’s saved. The advantage: you can revert to an earlier version of the document at any time, make comparisons and discover who’s to blame for spolling or error grammatical.

By default, there is no limit to the number of revisions stored per page or post. (Note only a single auto-save is made per post per editor — the most recent auto-save overwrites the previous one.) Every revision requires a separate row in WordPress’s posts table and perhaps multiple entries in the postmeta and term_relationships tables. That’s rarely a problem for smaller sites but it could affect the performance and efficiency of larger installations. Tables eventually become filled with redundant data which will never be used.

Limiting Revisions

The number of revisions can be set in WordPress’s wp-config.php file.

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Source: Sitepoint