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Re: Improve compression speeds in pg_lzcompress.c

From: Andres Freund <andres(at)2ndquadrant(dot)com>
To: John R Pierce <pierce(at)hogranch(dot)com>
Cc: pgsql-hackers(at)postgresql(dot)org
Subject: Re: Improve compression speeds in pg_lzcompress.c
Date: 2013-01-07 10:39:22
Message-ID: 20130107103922.GB5301@awork2.anarazel.de (view raw or flat)
Thread:
Lists: pgsql-hackers
On 2013-01-07 02:21:26 -0800, John R Pierce wrote:
> On 1/7/2013 2:05 AM, Andres Freund wrote:
> >I think there should be enough bits available in the toast pointer to
> >indicate the type of compression. I seem to remember somebody even
> >posting a patch to that effect?
> >I agree that it's probably too late in the 9.3 cycle to start with this.
>
> so an upgraded database would have old toasted values in the old compression
> format, and new toasted values in the new format in an existing table?
> that's kind of ugly.

Well, ISTM thats just life. What you prefer? Converting all toast values
during pg_upgrade kinda goes against the aim of quick upgrades.

Greetings,

Andres Freund

--
 Andres Freund	                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


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