When WordPress shows “Error establishing a database connection,” start with...

https://holdenlvxt779.theburnward.com/how-to-fix-error-establishing-a-database-connection-after-moving-wordpress-from-localhost-to-a-live-server

When WordPress shows “Error establishing a database connection,” start with quick checks: reload the page, confirm the database details, and see if the host is down. Then check server limits and repair the database