From: Julian Scarfe <julian@avbrief.com>
To: Tom Lane <tgl@sss.pgh.pa.us>
Cc: pgsql-performance@postgresql.org
Subject: Re: Inheritance, unique keys and performance
Date: Sun, 13 Jan 2008 19:28:18 -0000
Message-ID: <01fb01c8561a$76d6b4a0$0600a8c0@Wilbur> (raw)
References: <01a301c85552$24ab6270$0600a8c0@Wilbur>
<21684.1200170118@sss.pgh.pa.us>
<01b601c855c4$8ed20a60$0600a8c0@Wilbur>
<7212.1200250003@sss.pgh.pa.us>
From: "Tom Lane" <tgl@sss.pgh.pa.us>
> The
> problem you've got is that you need a nestloop-with-inner-indexscan
> plan type, where the inner side is an Append group (that is, an
> inheritance tree) --- and 8.1 doesn't know how to create such a plan.
> If you can update to 8.2 or later it should get better.
Isn't test 3 (scalar subqueries) also a nestloop-with-inner-indexscan with
an inner Append?
Julian
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: julian@avbrief.com, tgl@sss.pgh.pa.us
Subject: Re: Inheritance, unique keys and performance
In-Reply-To: <01fb01c8561a$76d6b4a0$0600a8c0@Wilbur>
* 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