When you use Microsoft SQL Server 2016 SP2 CU8 or later versions, you notice that it takes a long time to complete the concurrent inserts against tables that have columnstore indexes. Additionally, the transaction log may grow abnormally when these insert statements are run.


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


This issue is fixed in the following cumulative updates for SQL Server:

About cumulative updates for SQL Server:

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:


To work around the issue, follow these steps:

  1. Abort the insert queries to prevent the abnormal growth of transaction logs.

  2. Restrict the number of times that you issue select queries against tables that have a columnstore index and highly concurrent insert activity.


Learn about the terminology that Microsoft uses to describe software updates.

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