How can I identify database connection problems that might be causing a 500 error?

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Grade: Education Subject: Support
How can I identify database connection problems that might be causing a 500 error?
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Database connection errors often manifest as 500 errors. Check your website's configuration files (e.g., `wp-config.php` for WordPress) for correct database credentials (hostname, username, password, database name). Verify that the database server is running and accessible. Check the database server's error logs for connection failures. Confirm the database user has the necessary permissions for the website.