5

I just read the SQL 2016 Columnstore Index guide located here. We're going to have some rather large tables (hundreds of millions to billions of rows) in a SQL 2016 database that will be used for both OLTP and analytics.

These tables will be queried, primarily, one of two ways: 1) Users will retrieve rather small result sets based on specific discrete values in a Where clause (e.g., Where SubId = 'ABC'); 2) Users will retrieve larger results sets based on a date/time value ranges (e.g., Where ReadTime Between '2/1/2017' And '2/5/2017').

Since a columnstore index is better suited for scenerio #2 (I think), I'm considering making the clustered index non-columnstore (e.g., on SubId) for scenerio #1 and creating a non-clustered columnstore index (e.g., on ReadTime) for scenerio #2.

However, I'm not sure this is really any better than if I created a columnstore clustered index on ReadTime and a non-columnstore index on SubId.

I'm not sure how to make this decision.

  • 2
    Why not try both and test to find out? – LowlyDBA Feb 17 '17 at 16:14
  • What are the answers to the questions presented here ? – Max Vernon Feb 17 '17 at 16:28
2

Clustered Columnstore Indexes are designed to be used primarily with Data Warehouse, OLAP or reporting solutions. They are not great at WHERE x = y type queries; they are excellent at WHERE x < 1 and x > 1000000 type queries where the query processor can perform a range-scan on the CCI.

Assuming your workload is OLTP-critical, I'd recommend, without a ton of work on my part, to create the table with a standard B-Tree clustered index, and consider a well-designed nonclustered columnstore index that will help with your point #2.

If the OLTP component of the workload is small, or not very critical, but the reporting component is critical, you could possibly create the table as a clustered columnstore index, then add a number of starndard b-tree nonclustered indexes to help support the OLTP component.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.