pg.ddx.io  pgsql-performance@postgresql.org mailing list archive  

help / color / mirror / Atom feed

From: Tom Lane <tgl@sss.pgh.pa.us>
To: Gregory Stark <stark@enterprisedb.com>
Cc: Steven Flatt <steven.flatt@gmail.com>
Cc: Mark Kirkwood <markir@paradise.net.nz>
Cc: Bill Moran <wmoran@collaborativefusion.com>
Cc: Vivek Khera <vivek@khera.org>
Cc: Pgsql performance <pgsql-performance@postgresql.org>
Subject: Re: When/if to Reindex
Date: Fri, 24 Aug 2007 17:43:57 -0400
Message-ID: <6144.1187991837@sss.pgh.pa.us> (raw)
In-Reply-To: <876434zogy.fsf@oxford.xeocode.com>
References: <357fa7590707181008k65ab2f20l55bebb3c14f52770@mail.gmail.com>
	<11801.1186624308@sss.pgh.pa.us>
	<357fa7590708090651p71b9bc47n66739f8dbbb4ff57@mail.gmail.com>
	<357fa7590708220955h441cd75ap4c0f0342a1c30a14@mail.gmail.com>
	<873aybw2le.fsf@oxford.xeocode.com>
	<357fa7590708231525h2f48ce4dw3e48ecca5ccddf72@mail.gmail.com>
	<17370.1187927942@sss.pgh.pa.us>
	<46CE6883.10104@paradise.net.nz>
	<357fa7590708240722m204d678eid02b7ce3470eba1a@mail.gmail.com>
	<1759.1187972125@sss.pgh.pa.us>
	<357fa7590708240956k18e3ba7dv735cdaa99a667312@mail.gmail.com>
	<2774.1187976535@sss.pgh.pa.us>
	<876434zogy.fsf@oxford.xeocode.com>

Gregory Stark <stark@enterprisedb.com> writes:
> Should reindex be doing an in-place update?

Not if you'd like it to be crash-safe.

> Alternatively, why does the planner need access to the pg_class entry and not
> just the pg_index record?

For one thing, to find out how big the index is ... though if we could
get around that problem, it might indeed be possible to treat the
pg_index records as property of the parent table not the index itself,
which would give us license to read them without locking the index.

			regards, tom lane

view thread (23+ messages)  latest in thread

Message-ID: <6144.1187991837@sss.pgh.pa.us>
Permalink:  ../6144.1187991837@sss.pgh.pa.us/
Also on:    postgresql.org/message-id/6144.1187991837@sss.pgh.pa.us

copy link · copy postgr.es

reply

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: tgl@sss.pgh.pa.us, stark@enterprisedb.com, steven.flatt@gmail.com, markir@paradise.net.nz, wmoran@collaborativefusion.com, vivek@khera.org
  Subject: Re: When/if to Reindex
  In-Reply-To: <6144.1187991837@sss.pgh.pa.us>

* 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