KB3138321 - FIX: "Non-yielding Scheduler" condition when you run a query that contains a UNION operation in SQL Server 2014 or 2016

Symptoms

When you compile or run a query that contains a UNION operation in SQL Server 2014 or 2016, and the rowsets in the union contain lots of columns, a "Non-yielding Scheduler" condition may occur. Then, SQL Server generates a memory dump file.

Resolution

Cumulative update information

The issue was first fixed in the following cumulative update of SQL Server 2014:

Each new cumulative update for SQL Server contains all the hotfixes and all the security fixes that were included with the previous cumulative update. We recommend that you download and install the latest cumulative updates for SQL Server 2014:



Status

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

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