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Re: Parallel query execution

From: Bruce Momjian <bruce(at)momjian(dot)us>
To: Pavel Stehule <pavel(dot)stehule(at)gmail(dot)com>
Cc: Stephen Frost <sfrost(at)snowman(dot)net>,Michael Paquier <michael(dot)paquier(at)gmail(dot)com>,Josh Berkus <josh(at)agliodbs(dot)com>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: Parallel query execution
Date: 2013-01-16 21:18:38
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Lists: pgsql-hackers
On Wed, Jan 16, 2013 at 10:06:51PM +0100, Pavel Stehule wrote:
> 2013/1/16 Stephen Frost <sfrost(at)snowman(dot)net>:
> > * Bruce Momjian (bruce(at)momjian(dot)us) wrote:
> >> I am not sure how a COPY could be easily parallelized, but I supposed it
> >> could be done as part of the 1GB segment feature.  People have
> >> complained that COPY is CPU-bound, so it might be very interesting to
> >> see if we could offload some of that parsing overhead to a child.
> >
> > COPY can certainly be CPU bound but before we can parallelize that
> > usefully we need to solve the problem around extent locking when trying
> > to do multiple COPY's to the same table.
> Probably update any related indexes and constraint checking should be
> paralellized.

Wiki updated:

  Bruce Momjian  <bruce(at)momjian(dot)us>

  + It's impossible for everything to be true. +

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