💡 WordPress uses MySQL as its database management system. WordPress database is where all of the necessary website data is stored. Not just the basic information like usernames and passwords but posts, pages and comments, even the website theme and WordPress configuration settings.
Here you can find various SQL snippets and PHPMyAdmin tips.
In this post I discussed an example where wp_options table had 900k rows of plugin-based data in it, causing the wp-admin dashboard to load slowly. As noted there, good coding practice is for each plugin to create its own database tables and use those instead of default WP tables. While the WordPress community actively improves … Read full article →
WooCommerce plugin uses the wp_actionsscheduler_actions table in the database to log scheduled actions such as cron’s running, product synchronization, upgrade, etc. These actions should be deleted once they are executed but this doesn’t always happen, in most cases, this table uses an InnoDB database engine with a row-level locking feature meaning that multiple queries can … Read full article →
WordPress uses the wp_commentmeta and wp_comments tables to store comments and their data. To delete all comments in WordPress simply empty those tables in the database: To delete all spam comments use: To delete all unapproved comments use: NOTE: In the above commands change wp_ prefix with the table prefix that you are using *(view … Read full article →
For high-traffic websites, I advise developing a stagging website if you make significant updates or even switch the WordPress theme entirely. But one significant problem I encountered while moving from the staging site to the live one is that all database tables are updated, which could result in financial loss if the website receives multiple … Read full article →
Here are five different methods to create a new WordPress Admin user. In all of the examples below I will use the following username/password combination, so make sure to change it before running any of the commands: username123 change username123 with your username password123 change password123 with your password [email protected] change [email protected] with your email … Read full article →
This simple query allows you to transfer all posts from one user to another. SQL query This will assign all posts from author ID=14 to the user with ID=1 (admin). WP-CLI This will remove the user [email protected] and assign all his posts to user with ID=1 (admin).
After a plugin is deinstalled from a WordPress website it will either remove all its data from the database or leave it in case the plugin is installed again. Upon deactivation, if the plugin’s data isn’t removed from the database you should manually remove it in order to optimize the database and get rid of … Read full article →
Post revisions are a WordPress feature that allows you to undo changes and go back to an earlier version of your posts and pages, it works by auto-saving every 60s while you edit content. Since revisions can take up a lot of space in the database, it is a good idea to delete them. or You … Read full article →
Many users choose to host their images on an external service to reduce the load on their hosting. If you are interested in doing this, you will only have to change the location of all the images that you have already uploaded. To do this, you need to make two SQL queries in your database: 1. … Read full article →
Here is how to add table indexes, keys, and auto_increment fields to WordPress core database tables. These commands will fix the following database errors caused by missing primary keys: ⚠️ NOTE: Before running any of the following commands make sure to create a backup of the database. This commands will only fix your WordPress Core … Read full article →