From: Jan Wieck <JanWieck@Yahoo.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Hannu Krosing <hannu@tm.ee>
Cc: Peter Galbavy <peter.galbavy@knowtion.net>
Cc: pgsql-hackers@postgreSQL.org
Cc: pgsql-interfaces@postgreSQL.org
Subject: Re: More thoughts about FE/BE protocol
Date: Thu, 10 Apr 2003 16:28:46 -0400
Message-ID: <3E95D3FE.5DE02EA6@Yahoo.com> (raw)
References: <10478.1049927451@sss.pgh.pa.us>
<003f01c2ff40$9f1a0e70$7c28a8c0@cblan.mblox.com>
<3625.1049983061@sss.pgh.pa.us>
<1049993435.1886.24.camel@fuji.krosing.net>
<5015.1049993977@sss.pgh.pa.us>
Tom Lane wrote:
>
> Hannu Krosing <hannu@tm.ee> writes:
> > Tom Lane kirjutas N, 10.04.2003 kell 16:57:
> >> See my response to ljb --- I think that in practice people assemble each
> >> message before sending anyway.
>
> > I just tested it by running "select *" on 68M records (6.5 GB data)
> > table and you seem to be wrong - while psql shows nothing, its size
> > starts rapidly growing (I ^C it at ~500M) , while backend stays at
> > stable 32M, which indicates that postgres starts to push data out as
> > fast as it can get it.
>
> Sure. "Message" here is at the granularity of one data row, not an
> entire query result.
Could even be smaller since TOASTed items don't get loaded at the row
level but rather one after another. So a 68M row consisting of 4 17M
fields doesn't require 68M of memory to be sent to the client.
Jan
--
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To: pgsql-interfaces@postgresql.org
Cc: JanWieck@Yahoo.com, tgl@sss.pgh.pa.us, hannu@tm.ee, peter.galbavy@knowtion.net, pgsql-hackers@postgreSQL.org
Subject: Re: More thoughts about FE/BE protocol
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