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.
Resolution
This problem was first fixed in the following cumulative update for SQL Server:

Cumulative Update 1 for SQL Server 2014 SP1

Cumulative Update 7 for SQL Server 2014

About cumulative updates for SQL Server
Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. Check out the latest cumulative updates for SQL Server:
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.
Note This is a "FAST PUBLISH" article created directly from within the Microsoft support organization. The information contained herein is provided as-is in response to emerging issues. As a result of the speed in making it available, the materials may include typographical errors and may be revised at any time without notice. See Terms of Use for other considerations.
Properties

Article ID: 3042544 - Last Review: 06/22/2015 14:26:00 - Revision: 2.0

Microsoft SQL Server 2014 Developer, Microsoft SQL Server 2014 Enterprise, Microsoft SQL Server 2014 Express, Microsoft SQL Server 2014 Standard, Microsoft SQL Server 2014 Web, Microsoft SQL Server 2014 Service Pack 1

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