Error Establishing a Database Connection in WordPress: Fix

What this problem is

WordPress shows: Error establishing a database connection.

Why it happens

• Incorrect DB credentials in wp-config.php
• Database server is down or overloaded
• Corrupted database tables
• Exceeded database user limits

Prerequisites

• Access to wp-config.php
• Hosting panel access (MySQL status, phpMyAdmin)

Diagnosis

1. Verify DB_NAME, DB_USER, DB_PASSWORD, DB_HOST.
2. Check if the database server is up in the hosting panel.
3. Try logging into phpMyAdmin with the same credentials.

Detailed steps

Step 1) Fix credentials in wp-config.php

Update values to match hosting database user and password.

Step 2) Check DB host value

Some hosts require a specific DB_HOST (not always localhost).

Step 3) Repair the database (if tables are corrupted)

Use the dedicated database repair method if needed.

Expected results

• Site loads normally and DB connection is stable

What to do if it fails

• Contact hosting to confirm MySQL service health and whether your account hits limits

Best practices

• Keep backups and monitor DB resources on high-traffic sites