The Alter Index command can be used to reduce the size of a Non-Clustered Index. To reduce the size of a Non-Clustered Index, we will be using the DATA_COMPRESSION = ROW option to compress the Index by using row compression. The other options are None and Table
Here’s the query. Observe that the REBUILD keyword is used with the WITH clause since we are modifying an existing index.
ALTER INDEX IX_WorkOrder_ProductID
WITH (DATA_COMPRESSION = ROW)