“Error establishing a database connection” message; usual suggested fixes aren’t helping

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Hello!

I have a small WordPress blog that I host on DigitalOcean. A few days ago our website became inaccessible with the error message “Error establishing a database connection.”

I took a look at the error log and there’s no indication that it’s a memory issue.

It says:

Server upgrade from ‘80032’ to ‘80033’ started.

And then:

failed with error code = 3664, error message = ‘Failed to delete SDI ‘mysql.tables_priv’ in tablespace ‘mysql’.’

Before it says “failed to upgrade server.”

I followed the guidance found on this subreddit and [elsewhere]).

I first checked the database login credentials in wp-config.php, and the information is seemingly correct. However, when I try to connect to the database via the console, I get the error:

Can’t connect to local MySQL server through socket ‘/var/run/mysqld/mysqld.sock’ (2)

Similarly, when I attempt a database repair and insert

define(‘WP_ALLOW_REPAIR’, true);

into the wp-config file, the database repair page doesn’t appear and I still get the same “Error establishing a database connection” message.

Any tips on where I can look next to help resolve the issue?

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