You administer a Microsoft SQL Server 2014 database that contains a table named OrderDetail.
You discover that the NCI_OrderDetail_CustomerID non-clustered index is fragmented. You need to reduce fragmentation. You need to achieve this goal without taking the index offline.
Which Transact-SQL batch should you use?
REORGANIZE specifies to reorganize the index leaf level. The REORGANIZE operation is always performed online. This means long-term blocking table locks are not held and queries or updates to the underlying table can continue during the ALTER INDEX REORGANIZE transaction.
References:https://docs.microsoft.com/en-us/sql/t-sql/statements/alter-index-transact-sql
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