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.
For more information about what Query Monitor can do, please visit https://github.com/johnbillion/query-monitor.

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:

    WordPress - Sidebar - Plugins

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

    WordPress - Search plugins text box

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

    WordPress - Query Monitor install

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

    WordPress - Query Monitor 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:

    WordPress - 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.

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