How to install and use the Query Monitor plugin

This article describes how to install and use the Query Monitor plugin, a debugging tool that helps you monitor WordPress performance. With Query Monitor, you can track many things, including:

• Database queries.
• HTTP request and response headers.
• Scripts, including hooks and actions.
• Site environment information, including the server, PHP, MySQL, and WordPress.

Installing the plugin

To install Query Monitor on your WordPress site, follow these steps:

1. Log in to your WordPress site as the administrator.
2. In the left sidebar, click Plugins:

   

3. Click Add New.

4. In the Search plugins text box, type query monitor, and then press Enter:
   

   

5. Locate Query Monitor, and then click Install Now:
   

   

6. After WordPress finishes installing the plugin, click Activate. The Query Monitor appears in the toolbar:
   

   

Using the plugin

After you install the Query Monitor plugin, you are ready to monitor your site. To do this, follow these steps:

1. Log in to your WordPress site as the administrator.
2. On the toolbar, select an option from the Query Monitor menu:

   

   For complete information about all of these options, please see the Query Monitor documentation at https://github.com/johnbillion/query-monitor. Some of the most useful options are:

   • Queries: This option shows the raw database queries that were used to help generate the current page, as well as the functions that ran the queries.
   • Request: This option shows the HTTP request for the current page.
   • Scripts: This option shows all of the script files loaded for the current page.
   • Styles: This option shows all of the style (CSS) files loaded for the current page.
   • Hooks & Actions: This option shows all of the hooks and their associated actions for the current page.
   • Environment: This option shows environment settings for the site, including PHP, MySQL, WordPress, and the web server.

More Information

For more information about the Query Monitor plugin, please visit https://wordpress.org/plugins/query-monitor.