System Databases

The system databases exist to support the operation of SQL Server. The four system databases—master, model, msdb, and tempdb—are created by the installation program. The system databases are said to contain “metadata,” or data about data. These databases cannot be dropped.

master

As the name implies, the master database is the repository for all system-wide information for SQL Server. If an object is defined at the server level, it is stored in master. Login accounts, configuration settings, system-stored procedures, and the existence of other databases are recorded in the master database. SQL Server will not run if the master database is damaged or corrupt; therefore, it is imperative that the master database is backed up on ...

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