Summary
Microsoft SQL Server 2014 persists columnstore data as large object (LOB) data types. When columnstore data is read, it flows through a buffer pool to the columnstore object pool. The fix in this article changes the life cycle of these LOB pages within the buffer pool to improve memory availability to the columnstore object pool for improved query performance.
The decreased memory availability to the columnstore object pool occurs because of a regression that occurs after you apply update 3029977.
Resolution
This fix is included 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.
