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Re: Significantly larger toast tables on 8.4?

From: "Alex Hunsaker" <badalex(at)gmail(dot)com>
To: "Philip Warner" <pjw(at)rhyme(dot)com(dot)au>
Cc: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>, "Gregory Stark" <stark(at)enterprisedb(dot)com>, "Stephen R(dot) van den Berg" <srb(at)cuci(dot)nl>, "Robert Haas" <robertmhaas(at)gmail(dot)com>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Significantly larger toast tables on 8.4?
Date: 2009-01-04 05:15:09
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers
On Sat, Jan 3, 2009 at 21:56, Philip Warner <pjw(at)rhyme(dot)com(dot)au> wrote:
> Alex Hunsaker wrote:
>> For the record I just imported a production database that sits at
>> about ~20G right now with *zero* size increase (rounding to the
>> nearest gigabyte).  That's with basically the exact same schema just
>> different data.
> Guessing you don't have many plain text rows  > 1M.

Probably not.

>> I don't suppose you could export some random rows and see if you see
>> any size increase for your data?  My gut says you wont see an
>> increase.
> Will see what I can do.

Actually assuming they dont have any multibyte chars you should just
be able to do something like the below on your existing database.

-- show anything we save a megabyte on

select die_id, pg_size_pretty(savings) from
( select length(debug) - pg_column_size(debug) as savings, die_id from
fooa) as foo
where savings > 1024*1024 order by savings desc;

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Subject: Re: Significantly larger toast tables on 8.4?

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