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ROLAP Writeback Vs MOLAP Writeback Expand / Collapse
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Posted Monday, March 25, 2013 10:56 AM
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Have been using the Writeback facility in SSAS and wanted to understand the difference between the ROLAP Writeback and MOLAP Writeback.

My understanding is that ROLAP Writeback would allow you to update cell values for a measure group, which in turn update the cube and create a writeback table in the source database. This I have tested and works fine and the writeback table in the source database gives us the delta records of what has changed.

For MOLAP Writeback only updates the cube and does not create insert into the writeback table. I tested this and and it does not do what I expect. It updates the cube and inserts into the writeback table in the relational source just like the ROLAP Writeback.

So whats the difference ?




Post #1435050
Posted Monday, August 3, 2015 11:28 AM
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I'm still learning the ins and outs of writeback. But as this is an old post, I will offer my best educated guess at this point.

With small amounts of data there's probably no noticeable difference. But with large amounts of data in the write back table the MOLAP storage mode will be more efficient. I reserve the right to modify this answer in the future.

Does that help?



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