Many websites are made of two parts: files and a database. The files contain the application code, themes, plugins, and uploads. The database contains the content and settings the application uses.
What Lives in the Database
For WordPress, the database stores posts, pages, menus, users, settings, comments, and many plugin records. For shops, it may also store orders and customer details.
Database Users Matter
A database user is the account your website uses to connect to the database. Use a dedicated user per application where possible. Do not reuse one database user across unrelated sites.
Backups Need the Database
A file backup without the database will not restore most CMS sites properly. Always back up both files and database before migrations, major updates, or cleanup work.
Be Careful With Manual Edits
Tools such as phpMyAdmin are powerful. A small mistake can delete important data. Export a backup before running manual queries or bulk changes.
If your site shows database connection errors, check the database name, username, password, host, and whether the database service is available.
The Database Is Separate from Website Files
WordPress and similar applications store posts, users, settings and orders in MySQL or MariaDB while themes, uploads and code live as files. A complete migration or backup normally needs both parts from the same point in time.
Use Dedicated Credentials
Create a database and user for the application and grant only the required permissions. Do not reuse one powerful user across unrelated sites. Keep credentials in the application's protected configuration and never commit them to a public repository.
Maintain and Diagnose Carefully
Use phpMyAdmin or command-line tools to inspect size, tables and indexes, but back up before bulk changes. Slow pages may come from inefficient queries, missing indexes or oversized log tables. Check application and database logs rather than deleting tables based only on their names.
