Optimize WordPress MySQL tables through Cron, behind the scenes

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To regularly optimize my WordPress database tables, I created a small plugin that utilizes the WordPress Cron feature. This comes in handy to perform database optimization for WordPress on a regular basis, without forgetting about it. Just activate and enjoy. And here is the plugin code …

Saotn MySQL Database Optimizer #

Keeping your WordPress MySQL database optimized is a must for a fast performing website. Every post, draft, revision and comment adds data to your database, and removing revisions, drafts and comments creates empty space between data. This makes your database huger and fragmented.


Defragmenting the data puts all data back in order, removing empty spaces and results in a smaller database. The defragmented database performs faster because MySQL will be able locate information much faster.

You can use this as a must-use plugin by placing the file in the wp-content/mu-plugins directory, or as a regular plugin in wp-content/plugins (create a folder saotn-optimizer yourself), which you then must activate through the WordPress Dashboard.

You are free to use, change and customize the plugin code. I’ve based it off Pressjitsu’s transient cleaner plugin. All the plugin does is executing an OPTIMIZE TABLE statement for every table in your WordPress MySQL database on a daily or weekly basis (yours to choose).

 * Plugin Name: Saotn Database Table Optimizer
 * Plugin URI: https://www.saotn.org
 * Donate URI: https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=J24FGGU96YSUY
 * Description: Optimizes WordPress database behind the scenes by executing an OPTIMIZE TABLE statement on all MySQL tables, 'daily' or 'hourly'.
 * Version: 1.0.2
 * Author: Jan Reilink
 * Author URI: https://www.saotn.org
 * License: GPLv2

class Saotn_Db_Optimize_Tables_Cron {
  public static function load() {
    add_action( 'init', array( __CLASS__, 'schedule_events' ) );

   * Schedule cron events, runs during init.
  public static function schedule_events() {
    if ( ! wp_next_scheduled( 'saotn_db_optimize_tables_cron' ) )
      // wp_schedule_event( time(), 'daily', 'saotn_db_optimize_tables_cron' );
      wp_schedule_event( time(), 'hourly', 'saotn_db_optimize_tables_cron' );
      add_action( 'saotn_db_optimize_tables_cron', array( __CLASS__, 'optimize_tables' ) );

  public static function optimize_tables() {
    global $wpdb;
    $bDebug = TRUE;
    $tables = $wpdb->get_col( "SHOW TABLES" );
    foreach ( $tables as $table ) {
      if ( $wpdb->query( "OPTIMIZE TABLE $table" ) !== FALSE ) {
        if ( $bDebug ) {
          error_log( "Saotn_Db_Optimizer ran successfully on $table" );


Use a plugin like Advanced Cron Manager to verify this database optimization WordPress Cron.

Saotn Optimizer on GitHub as Gist, and local download #

You can find the Gist here on GitHub:
https://gist.github.com/Digiover/b3d33495ba1a400a84068120eb8addbc, or as a text file on Saotn: wp-database-tables-optimizer.txt (rename .txt to .php).

Optimize WordPress database alternatives #

Two alternatives for my very basic plugin are WP Sweep and WP Optimize.

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3 Replies to “Optimize WordPress MySQL tables through Cron, behind the scenes”

    1. Thanks for your reply Jean! I’m familiar with MySQLtuner, which indeed is a great script to tune MySQL. Somehow I just like going through MySQL’s configuration settings to see what’s new and can be optimized, and therefore I mostly do it myself manually. MySQLtuner can then be used to verify the settings.

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