Identity Integers And Columnstore

Niko Neugebauer looks at how clustered columnstore indexes handle identity integers with respect to data load times:

This blog post will try to respond this question from the perspective of the data loading performance.

For this research I decided to pick 3 distinct scenarios to investigate, which refer to different ways to approach the solution:
– a CCI table with an Identity column
– a CCI table with a Sequence as a default value
– a CCI table without Identity

There’s a pretty substantial performance difference, so this is well worth the read for large columnstore data loads.

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Preventing Issues With Columnstore Indexes

Kevin Chant has a post covering issues in his experience with the creation of columnstore indexes: Error due to online statement It’s a very common error caused usually by somebody copying a rowstore “Create Index” command. The “online=on” option you use with rowstore indexes does not work with creating columnstore indexes yet. For the record the […]

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Avoid Key Lookups On Clustered Columnstore Indexes

Joey D’Antoni points out a potential big performance problem with clustered columnstore indexes: In the last year or so, with a large customer who makes fairly heavy use of this pattern, I’ve noticed another concern. Sometimes, and I can’t figure out what exactly triggers it, the execution plan generated, will do a seek against the […]

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