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toast by chunk-end (was Re: PG_PAGE_LAYOUT_VERSION 5 - time forchange)

From: Alvaro Herrera <alvherre(at)commandprompt(dot)com>
To: Zdenek Kotala <Zdenek(dot)Kotala(at)Sun(dot)COM>
Cc: Heikki Linnakangas <heikki(dot)linnakangas(at)enterprisedb(dot)com>, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Gregory Stark <stark(at)enterprisedb(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: toast by chunk-end (was Re: PG_PAGE_LAYOUT_VERSION 5 - time forchange)
Date: 2008-11-17 21:10:21
Message-ID: 20081117211021.GN4291@alvh.no-ip.org (view raw or flat)
Thread:
Lists: pgsql-hackers
Zdenek Kotala wrote:
> Alvaro Herrera napsal(a):
>> Heikki Linnakangas wrote:
>>
>>> Hmm, you're right. I think it can be made to work by storing the 
>>> *end*  offset of each chunk. To find the chunk containing offset X, 
>>> search for  the first chunk with end_offset > X.
>>
>> FWIW I'm trying to do this.  So far I've managed to make the basic thing
>> work, and I'm about to have a look at the slice interface.

Okay, so this seems to work.  It's missing writing the sanity checks on
the returned data, and a look at the SGML docs to see if anything needs
updating.  I'm also going to recheck code comments that may need
updates.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
PostgreSQL Replication, Consulting, Custom Development, 24x7 support

Attachment: toast-chunkend.patch
Description: text/x-diff (14.5 KB)

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