Of the common WordPress errors, this is pretty self-explanatory. The error lets you know something broke the connection to your WordPress database.
DATABASE ESTABLISHING ERROR CAUSES:
- wp-config.php error
- Problems with your hosting provider
- You’ve been hacked! And here I was thinking this particular WordPress error is no big deal.
DATABASE ESTABLISHING ERROR SOLUTIONS:
a. Edit your wp-config.php file
Access your wp-config.php file via File Manager or FTP and confirm if the database name, host, username and password are correct. If you’re stuck or don’t know what to do first, consider teaching yourself a few things about editing wp-config.php files.
b. Fix issues with your web host
If your wp-config.php is looking right and this WordPress error is still a problem, you should talk to your WordPress hosting provider. They will be able to tell you whether the server is down or your database was shut down for exceeding its quota. If they tell you everything looks good on their end, it is time to implement some WordPress security on your site.
c. Scan your website to determine if it’s compromised
Hackers don’t sleep. No, they don’t. You can fall victim to a hacker anytime, especially if you don’t know how to secure your WordPress website. To ensure your website hasn’t been hacked, scan it using a tool such as Sucuri Sitecheck. If you get bad news, just stay calm and check out this my site was hacked post over at WordPress Codex.