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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Linked Servers And Columnstore

Niko Neugebauer continues his columnstore series by looking at how they interact with linked servers: Lets us make sure everything is fine for data transfer and as we are using our source server (SQL Server 2014) with Linked Server to SQL Server 2016, let us insert a couple of ObjectIds to the T1 table that we have […]

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Columnstore Segment Elimination Pains

Niko Neugebauer shows us two pain points with row group (segment) elimination on clustered columnstore indexes: Still this gives us processing of just 1 Segment with 253 lob logical reads vs 6 Segments and 2669 lob logical reads in the original query. But wait, that’s not all! It can get significantly worse! Let’s use the […]

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