KB4092669 - FIX: SQL Server doesn't detect a deadlock condition when you run a merge statement

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SQL Server 2014 Developer - duplicate (do not use) SQL Server 2014 Enterprise - duplicate (do not use) SQL Server 2014 Enterprise Core - duplicate (do not use) SQL Server 2014 Standard - duplicate (do not use) Flere...Mindre

Symptoms

When you run a merge statement in Microsoft SQL Server, a deadlock condition may occur between the merge operation and a background thread on the Clustered Columnstore Index (CCI) table. However, SQL Server does not detect the deadlock.

Notes

No error report is logged if trace flag 1222 is enabled.
No event is logged if you use the XEvent log to capture deadlocks and then try to trigger the event.

Resolution

This issue is fixed in Cumulative Update 11 for SQL Server 2014 Service Pack 2.

Each new cumulative update for SQL Server contains all the hotfixes and security fixes that were in the previous build. Check out the latest cumulative updates for SQL Server 2014.

Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

References

Learn about the terminology Microsoft uses to describe software updates.