Columnstore Indexes And Partition Operations

Niko Neugebauer continues his columnstore index series, this time looking at how partitioned tables behave:

Let’s start with a simple test of merging the 2007 partition with the year 2008, by issuing the following command:

It might ready you a reasonably huge surprise, but this command will fail, if you are using the Columnstore Indexes.

The very same command will function without any problem, if we would simply avoid creating Clustered Columnstore Index …
The reason behind this limitation has to do with the fact that Columnstore Indexes do not sort or control the boundaries of the data, and this is biting the total implementation in such operations.

It’s an interesting read, and a little disappointing.

Related Posts

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 […]

Read More

Tempdb Blocking With Non-Clustered Columnstore Indexes

Ned Otter runs into a tricky issue: I have a client that used Itzik Ben-Gan’s solution of creating a filtered nonclustered columnstore index to achieve batch mode on a rowstore (in fact I proposed that the client consider it). They have an OLTP system, and often perform YTD calculations. When they tested, processing time was reduced by […]

Read More

Categories

December 2017
MTWTFSS
« Nov Jan »
 123
45678910
11121314151617
18192021222324
25262728293031