KB4577836 - FIX: Inconsistency occurs when ghost rows are inserted into mapping index rowset

Symptoms

Consider the following scenario:

• When Tuple Mover compresses a Deltastore, it inserts rows into the new rowgroup and then compresses the columnstore index rowgroups.

• The mapping index will be updated once the new rowgroup is created.

In this situation, if you try to insert a row into index mapping rowset, you notice that inconsistency occurs.

Status

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

Resolution

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

• Cumulative Update 7 for SQL Server 2019

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:

• Latest cumulative update for SQL Server 2019

Workaround

To work around this issue, you may do one of the following:

1. Rebuild the index.

2. Avoid using non-clustered index on clustered columnstore indexes.

3. Disable Tuple Mover.

References

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