Horton

Re: TOAST usage setting

Tom Lane <tgl@sss.pgh.pa.us>

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From: Tom Lane <tgl@sss.pgh.pa.us>
To: "Jim C. Nasby" <decibel@decibel.org>
Cc: Bruce Momjian <bruce@momjian.us>, Zeugswetter Andreas ADI SD <ZeugswetterA@spardat.at>, Gregory Stark <stark@enterprisedb.com>, pgsql-hackers@postgresql.org
Date: 2007-06-05T01:28:22Z
Lists: pgsql-hackers 
"Jim C. Nasby" <decibel@decibel.org> writes:
> On Fri, Jun 01, 2007 at 01:50:12PM -0400, Bruce Momjian wrote:
>> The big question is do we want to drop the target tuple size down to
>> 512, and increase the chunk size to 8k for 8.3?

> If we do that people could see their disk space usage increase by up to
> 16x: currently 513 bytes fits in heap and takes (roughly) 513 bytes; if
> we make that change it would then get toasted and take 8K.

That argument is completely bogus --- having a toast chunk size of 8K
does not mean that smaller rows occupy 8K.

			regards, tom lane