Optimizing WordPress databases can effectively improve website speed and stability. Key steps include: 1. Clean up useless data, such as spam comments, revisions and drafts. You can limit the number of revisions by modifying configurations or plug-ins and delete invalid content in batches; 2. Optimize database tables, use plug-ins or SQL commands to repair and compress fragmented tables, and improve query efficiency; 3. Delete residual data of plug-ins and topics that are no longer used to avoid taking up space and causing conflicts, and manually clean up legacy configurations if necessary; 4. The database must be fully backed up before operation, and data can be exported with the help of plug-ins or control panels to ensure security. Perform the above regularly to keep the website running efficiently.
Optimizing your WordPress database is a key step to improve website speed and stability. Many people usually only focus on plug-ins and themes, but ignore the fact that the "garbage" in the database is actually accumulated more and more. Regular cleaning and optimization not only speeds up page loading, but also reduces the chance of errors.
1. Clean up useless data: Delete spam, revisions, and drafts
WordPress retains a lot of automatically saved content by default, such as article revisions, comments to be reviewed, and drafts. Although these contents will not immediately affect performance, accumulation will make the database bloated.
Delete old revisions : You can add a line of code in
wp-config.php
to limit saving up to several revisions, for example:
define('WP_POST_REVISIONS', 3);
Or batch cleanup has been revised directly through plug-ins (such as WP Optimize).Empty spam comments and comments to be reviewed : If you haven't logged in to the background for a long time, you may find that there are a lot of spam comments piled up in the comment area. Enter the Comments menu, filter the "Junk" status and delete it in batches.
Clean up auto-save drafts : Some drafts may have expired, manually deleting or using plug-in cleaning can free up space.
2. Optimize database tables: repair and compression
WordPress's database consists of multiple tables, and over time, some tables will become fragmented or damaged, causing queries to slow down.
You can optimize by:
- Use plugins such as WP-DBManager or phpMyAdmin to perform "optimize tables" operations regularly;
- If you are familiar with MySQL, you can also run SQL commands:
OPTIMIZE TABLE wp_posts, wp_postmeta, wp_comments, wp_options;
- Do a comprehensive check every few months to make sure all tables are healthy.
3. Delete plug-ins and theme data that are no longer used
Many users do not completely clear the data tables or options left by the old plug-in after replacing the plug-in. These "residual" information not only takes up space, but can also cause conflicts.
- When uninstalling the plug-in, check whether the option to "Uninstall Settings" is provided;
- If the data table remains after the plug-in is uninstalled, it can be deleted manually through the database management tool;
- For deleted topics, if you have used custom options before, there may be legacy configurations, so it is recommended to clean them together.
4. Regularly backup and then operate the database
Database optimization is a risky operation, especially when manually modifying the table structure or running SQL commands. Be sure to make a complete backup before operation.
- Use plug-ins (such as UpdraftPlus, BackupBuddy) to perform one-click backup;
- Or export the entire database through the host control panel;
- After the backup is completed, start cleaning or optimization actions.
Basically that's it. Don’t look at the many steps, it doesn’t take too much time. The key is to do it regularly. You will find that the website runs smoother and is much easier to maintain.
The above is the detailed content of How to optimize the WordPress database. For more information, please follow other related articles on the PHP Chinese website!

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