Error establishing a database connection

[Admin]

Well, I think the first step is to figure out what the actual database issue actually is.

To do so, you can enable WP_DEBUG mode in WordPress: Debugging in WordPress – Documentation

Then, when you see the error, you should get a more detailed error message.

If you get the error intermittently, it’s likely that the error you will see is the one covered by this article:

WordPress: User [...] already has more than 'max_user_connections' active connections

If you have a WordPress site, you may see intermittent “Error establishing a database connection” messages. When debugging this, you can may see the following error message: User xxx_xxxxxxxx already has more than ‘max_user_connections’ active connections This article explains what this means and how to fix it. What does this error mean In order to prevent a single website from overloading a database server, there is a limit on the number of database connections that can be created for a si…

But again: please make sure to check the error message first before taking actions that may not be helpful.