Before you restore the master database, if the database files are missing, you may need to either restore Microsoft SQL Server Disaster Recovery Elements for that instance, or rebuild it using the Microsoft SQL Server Rebuild Master utility. Restoring the master database requires that the restore operation have exclusive access to the SQL Server instance. To ensure this, the Microsoft SQL Server instance must be running in single-user mode. For complete instructions on rebuilding your Microsoft SQL Server master database, see the Microsoft SQL Server documentation.
Before restoring the master database, you must stop all applications which may be using that instance of Microsoft SQL Server. This includes some secondary services which are part of Microsoft SQL Server, such as the SQL Server Automation Agent (“SQL Server Agent” service). The only exception to this is Arcserve Backup itself; the Agent for Arcserve Database will ensure Arcserve Backup is not using any ARCserve Database that the instance might contain.
When you restore the master database, the Agent for Microsoft SQL Server automatically detects this. The agent will restart Microsoft SQL Server in Single-User Mode before executing the restore operation, and will return Microsoft SQL Server to Multi-User Mode at the conclusion of the master database restore.
Important! You must stop all applications and services other than Arcserve Backup that may be using databases in the Microsoft SQL Server instance for which you are restoring the master database. Otherwise, one of these other applications may re-connect to the SQL Server instance after it is restarted, and prevent the agent from performing the restore.
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