Improvement: Merge operation will consider the number of deleted rows in the rowgroup in SQL Server 2017

Applies to: SQL Server 2017 DeveloperSQL Server 2017 EnterpriseSQL Server 2017 Enterprise Core


Assume that you use SQL Server 2017. You will notice that ALTER INDEX REORGANIZE skips over the rowgroup with DICTIONARY_SIZE, regardless of how many deleted rows exist in therowgroup.  When you do a merge operation, this improvement will increase the index efficiency by using a thresholdthat is the number of deleted rows in the rowgroup.


This improvement is included in the following cumulative update for SQL Server:
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