Restoring the SQL Server Instance involves restoring all the databases (system databases and user-created databases) of a SQL Server instance to the same computer.
Before You Begin
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Rebuild the SQL Server instance by using one of the following methods: - 
Rebuilding the Master Database (Quick Rebuild) 
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Rebuilding Each SQL Server Instance (When Quick Rebuild Does Not Work) 
 
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Procedure
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Stop any application or services that are accessing the SQL databases. 
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Restoring SQL Databases to a Point in Time in the order that you require.