KB3042544 - FIX: Incorrect choice of a nested loops join strategy causes poor query performance in SQL Server 2014

Symptoms

When you use Microsoft SQL Server 2014 to run a query that uses a nested loops join, you experience poor query performance when an incorrect choice of a query execution plan occurs.

Cause

This behavior occurs because the query optimizer chooses an incorrect nested loops join strategy when incorrect cardinality estimates or incorrect operator costing is used.

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Status

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

References

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