💡 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.
While building and testing WooCommerce addons, I find myself in need of quickly deleting all WooCommerce products from the database. WPCLI is the easiest way to go, as you can achieve the desired results via a single line. NOTE: if your database prefix isn’t the default wp_, you’ll need to change it with your actual database … Read full article →
Instruction: Parameter PARAMETER TYPE DESCRIPTION DEFAULT REQUIRED $format string Output can be PHP date format or Unix timestamp. no yes $date string mysql2date() only recognizes “Ymd H:i:s” format, so the original timestamp string needs to be converted to this format. no yes $translate boolean If true, the specified date and format string will be passed … Read full article →
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 →
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).
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 →
There are several ways you can optimize the MySQL database used by your WordPress site: Optimize tables Optimize all tables in your database: OPTIMIZE TABLE wp_posts, wp_comments, wp_options, wp_usermeta, wp_term_relationships, wp_term_taxonomy, wp_termmeta; Replace wp_ with the database prefix that you are using for your WordPress installation. Repair tables Repair any damaged tables in your database: … 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 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 →
The SAVEQUERIES wp-config constant saves database queries to an array and We can use that array to display queries. The information saves each query, what function called it, and how long that query took to execute. To enable SAVEQUERIES add this to the wp-config.php file: Then in the footer of your theme put this: <?php … 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 →