Symptoms
This issue occurs when you run Data Manipulation Language (DML) statements on tables that contain clustered columnstore indexes. When this issue occurs, in the sys.column_store_row_groups dynamic management view (DMV), you see many new entries whose delta_store_hobt_id column does not display null values and total-rows column displays small numbers. You may also receive the following error message:
Non-yielding task detected in function = <FunctionName>::Get file = line = <LineNumber>
Additionally, a related dump file is generated.
Resolution
Service pack information
To resolve this issue, obtain Service Pack 1 for SQL Server 2014.
For more information about SQL Server 2014 Service Pack 1 (SP1), see bugs that are fixed in SQL Server 2014 Service Pack 1.
Cumulative update information
This issue was first fixed in the following cumulative update of SQL Server.
Cumulative Update 5 for SQL Server 2014 /en-us/help/3011055
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:
More Information
This issue occurs because every update or delete statement locks all delta stores. When all delta stores are locked, an insert statement will create a new delta store. This hotfix tries to only lock the delta stores that are affected by update or delete and creates new delta stores less rapidly if there are already many open delta stores.
Status
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
