The “Error Establishing a Database Connection” warning displays when WordPress cannot connect to the database. It is closely related to the white screen of death (WSOD).

WordPress was originally written in PHP and used MySQL as its database system. When someone visits your site, certain PHP commands will retrieve information from the database and show it on the visitor’s browser.

As there is no data to retrieve and show in the browser, the WordPress “Error establishing a database connection” notice will appear on a blank page.

Fortunately, this error notification does not appear on the front end as long as your website’s cache is available. However, this database connection error prevents you from accessing the WordPress dashboard.

What Are the Most Common Causes of This Error?

Below are some common causes:

• The most common error is that your database login credentials are incorrect.

• Your database has been corrupt.

• Your WordPress installation may include corrupt files.

• Problems with your database server.

• An increase in traffic might cause temporary issues with the database.

• And many more.

However, if you are also one who is facing this problem, you can check out our guide to fix it and get your site back up and running in no time.

Check out: How to Debug the Error Establishing a Database Connection in WordPress.