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Re: BufferAccessStrategy for bulk insert

From: Simon Riggs <simon(at)2ndQuadrant(dot)com>
To: Robert Haas <robertmhaas(at)gmail(dot)com>
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Postgres Hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: BufferAccessStrategy for bulk insert
Date: 2008-10-31 06:33:02
Message-ID: 1225434782.3971.482.camel@ebony.2ndQuadrant (view raw or flat)
Thread:
Lists: pgsql-hackers
On Thu, 2008-10-30 at 23:05 -0400, Robert Haas wrote:
> > Whatever timings you have are worth publishing.
> 
> Here are the timings for copying the first ten million integers into a
> one-column table created in the same transaction, with and without the
> patch.  As you can see, now that I've corrected my previous error of
> not putting CREATE TABLE and COPY in the same transaction, the savings
> are quite substantial, about 15%.  Nice!

I had faith. ;-)

Can you test whether using the buffer access strategy is a win or a
loss? Most of that gain is probably coming from the reduction in
pinning.

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Training, Services and Support


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