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

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 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

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