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 /en-us/help/3067839
Cumulative Update 7 for SQL Server 2014 /en-us/help/3046038
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.
