The database is most important for a WordPress website. It is like a source of information. It contains settings, files, themes, plugins, and other important information. But sometimes users get the issue in connecting the database while using the website. When this problem happens, it is known as Error establishing a database connection in WordPress; in short, it means that the server is not connecting the database. There might be many reasons behind this database connection failure. The Error is no difficult to solve.
Reasons for database connection error in WordPress
Make sure the database login details are correct Maybe the plugins of the website is creating the issue
Probably one of the themes is responsible for Error establishing a database connection in WordPress.
May be WordPress files are corrupted that is why the website is failing to connect the database
Solutions database connection error in WordPress
Submit correct database credentials
Get rid of plugins that are disturbing the issue
Themes which is corrupt needs to be removed
Remove files and upload the default file
These solutions would definitely figure out the Error, but in case, you dont find the solution, contact the WordPress administration team