Re: question on parallelism

On Wed, Jan 1, 2014 at 7:35 PM, Andrew McIntyre <amcintyre(at)m-m(dot)com> wrote:

> does postgres have this capability? specifically local intrapartition?
>
> http://pic.dhe.ibm.com/infocenter/db2luw/v10r5/topic/com.ibm.db2.luw.admin.partition.doc/doc/c0004557.html
>
> Nope. Here's a quick breakdown of what is done in parallel and what is
done sequentially in PostgreSQL.

Separate queries run in parallel, and can piggy back on eachother's
sequential scans. In essence all of the work that is done in parallelism
affects parallel queries.

There is no intra-query parallelism however. This means that partitioning
doesn't generally help here (although sequential scans on the same
partition by different queries can run in parallel with good results, a
single query cannot run several scans on different partitions in parallel).

If you need this sort of feature you are going to either need to go to a
related product (like Postgres-XC) or you are going to need to have some
other layer that can do the parallelism.

Best Wishes,
Chris Travers

> sorry for all the newbie pg questions...
> --
> ------------------------------
> Andrew McIntyre
> amcintyre(at)m-m(dot)com
> http://www.mindspring.com/~amcintyr/resume.htm
> ------------------------------
>

--
Best Wishes,
Chris Travers

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