More On Columnstore Batch Mode

Sunil Agarwal talks about batch mode processing with columnstore indexes:

While these results may not appear as dramatic on my laptop, the picture below shows the performance gains with Window Aggregates on a Server class machine with large DW database. The orange bar represents the query speed up we got with Window Aggregate operator in BatchMode. The highest speed up we saw was 289x!!

Batch mode is generally a huge benefit for data warehousing environments.

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Columnstore And Merge Replication

Niko Neugebauer tests whether merge replicated tables can use columnstore indexes: Adding this table to the publication will end up with the following, self-explaining error message, being very clear that the Clustered Columnstore Indexes are not supported for the Merge Replication[.] There is no surprise here, as the same Clustered Columnstore Indexes are not supported […]

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Trace Flag 834 And Columnstore Tables

Joe Obbish shows how trace flag 834 can solve a bottleneck when inserting into tables with clustered columnstore indexes: In my experience, when we get into a situation with high memory waits caused by too much concurrent CCI activity all queries on the server that use a memory grant can be affected. For example, I’ve […]

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