![]() For more information, see Rebuild System Databases. If severe damage to master prevents you from starting SQL Server, you must rebuild master. For more information, see Restore the master Database (Transact-SQL). If you can start the server instance, you should be able to restore master from a full database backup. Restore master from a current database backup. If master becomes unusable, you can return the database to a usable state in either of the following ways: If you do, master must be backed up more frequently.Äo not set the TRUSTWORTHY option to ON for the master database. Changing server or database configuration valuesÄo not create user objects in master.Creating, modifying, or dropping any database.When you work with the master database, consider the following recommendations:Īlways have a current backup of the master database available.Ä«ack up the master database as soon as possible after the following operations: Setting the database or primary filegroup to READ_ONLY.Renaming the database or primary filegroup.Removing the primary filegroup, primary data file, or log file.Dropping the guest user from the database.Creating triggers on system tables in the database.Creating a full-text catalog or full-text index.The default collation is the server collation. ![]() Backups, only a full database backup can be performed on the master database. ![]() ![]() If master becomes unusable, you can return the database to a usable state in either of the following ways: Restore master from a current database backup. Startup of an instance of SQL Server requires that the master database is accessible and at least partly usable. The following operations cannot be performed on the master database: To restore any database, the instance of SQL Server must be running. Database optionįor a description of these database options, see ALTER DATABASE (Transact-SQL). To restore a full database backup of master, use the following RESTORE DATABASETransact-SQL statement: RESTORE DATABASE master FROM WITH REPLACE The REPLACE option instructs SQL Server to restore the specified database even when a database of the same name already exists.For Azure SQL Database single databases and elastic pools, the user has no control over these database options. ![]()
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