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This error occurs while I restore database from .bak file

A system assertion check has failed. Check the SQL Server error log for details. Typically, an assertion failure is caused by a software bug or data corruption. To check for database corruption, consider running DBCC CHECKDB. (Microsoft SQL Server, Error: 3624)

After this the Database goes offline and it property sets to Single User.

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migrated from stackoverflow.com Jan 11 '13 at 13:28

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contact product support support.microsoft.com –  Remus Rusanu Jan 11 '13 at 11:23
    
What does the SQL Server Log report? –  Dave Jan 11 '13 at 13:03
    
What is SELECT @@VERSION? Have you run DBCC CHECKDB like the error message suggests? –  Aaron Bertrand Jan 11 '13 at 16:18

1 Answer 1

If SELECT @@VERSION < 10.50.1746.0 then it is possible that the issue you are coming across has been fixed in a specific cumulative update, and can be averted by updating your instance.

The particular issue is described here:

KB #980832 : FIX: "A system assertion check has failed" error message...

The cumulative update is here:

Cumulative Update #4 for SQL Server 2008 R2 RTM

But I recommend applying the most recent service pack and cumulative update available (since they come with a slew of other fixes as well):

SQL Server 2008 R2 Service Pack 2

Cumulative Update #4 for SQL Server 2008 R2 Service Pack 2

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