Symptoms

Assume that you enable Multiple Active Result Sets (MARS) in Microsoft SQL Server 2014. When you load data into a clustered columnstore index by parallel trickle inserts from different SQL Server sessions, you receive the following error message:

35377: When MARS is on, accessing clustered columnstore indexes is not allowed.

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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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