Symptoms
After you apply Cumulative Update 3 for Microsoft SQL Server 2012 Service Pack 1 to an instance of SQL Server or in SQL Server 2014, SQL Server performance might be slow, and a memory leak might occur.
If you run the following query when this problem occurs, you see that the Mem in MB value and the row count value keep increasing for the MEMOBJ_COMPILE_ADHOC memory object:
select type, sum(pages_in_bytes)/1024.0/1024.00 'Mem in MB', count (*) 'row count' from sys.dm_os_memory_objects
where type like '%MEMOBJ_COMPILE_ADHOC%'
group by type
Notes
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The DBCC FREEPROCCACHE command does not help reduce the Mem in MB value.
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This problem only occurs when you run many sp_prepare procedures to prepare parameterized Transact-SQL statements.
Resolution
The issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 1 for SQL Server 2014 /en-us/help/2931693
Cumulative Update 7 for SQL Server 2012 SP1 /en-us/help/2894115
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
See the terminology that Microsoft uses to describe software updates.
