From: Nikolas Everett <nik9000@gmail.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: Kevin Grittner <Kevin.Grittner@wicourts.gov>
Cc: pgsql-performance@postgresql.org
Subject: Re: Why does this query write to the disk?
Date: Thu, 18 Sep 2008 14:44:27 -0400
Message-ID: <d4e11e980809181144v20994c62g49002f2dc4725803@mail.gmail.com> (raw)
In-Reply-To: <23587.1221761600@sss.pgh.pa.us>
References: <d4e11e980809181030t3f09db94vd5b69d7868271906@mail.gmail.com>
<48D24E6C.EE98.0025.0@wicourts.gov>
<23587.1221761600@sss.pgh.pa.us>
"Kevin Grittner" <Kevin.Grittner@wicourts.gov> writes:
> http://wiki.postgresql.org/wiki/Hint_Bits
On Thu, Sep 18, 2008 at 2:13 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> freezing old tuples
hash join was spilling out to temp files
>
Since this was a new table and the writes to the table's disk were very
large it was probably the hint bits.
The small table was about 1300 rows and my work_mem was 100MB so the writes
to the main disk probably was not hash spillage. They were tiny, so I'm not
worried about them.
Thanks very much,
Nik
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Reply to all the recipients using the --to and --cc options:
reply via email
To: pgsql-performance@postgresql.org
Cc: nik9000@gmail.com, tgl@sss.pgh.pa.us, Kevin.Grittner@wicourts.gov
Subject: Re: Why does this query write to the disk?
In-Reply-To: <d4e11e980809181144v20994c62g49002f2dc4725803@mail.gmail.com>
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
This inbox is served by DDX for PostgreSQL; see mirroring instructions
for how to clone and mirror all data and code used for this inbox