Symptoms

Assume that you have a table that has the clustered columnstore index in Microsoft SQL Server 2014. When you run DML statements such as an update or a delete against the table, you receive the following error message, and a memory dump file is generated:

Error: 8646, Severity: 21, State: 1.
Unable to find index entry in index ID 1, of table <id>, in database '<database>'. The indicated index is corrupt or there is a problem with the current update plan. Run DBCC CHECKDB or DBCC CHECKTABLE. If the problem persists, contact product support.

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

The issue was first fixed in the following cumulative update of 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. We recommend that you download and install 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.

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