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Sql Server System Databases

Master: Master database contains instance metadata and SQL Server system configuration settings but system objects are stored in resource database.

Model: Model database is a template for creating a new database.

Msdb: Msdb database is used by SQL Server Agent.

Resource: Resource database is a read-only database that contains all the system objects that are included with SQL Server.

Tempdb: Tempdb database is a resource that is available to all users is used to hold temporary objects.

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