From: | Alvaro Herrera <alvherre(at)commandprompt(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | Greg Smith <greg(at)2ndquadrant(dot)com>, Florian Weimer <fweimer(at)bfk(dot)de>, pgsql-general(at)postgresql(dot)org |
Subject: | Re: \dt+ sizes don't include TOAST data |
Date: | 2010-01-25 03:04:18 |
Message-ID: | 20100125030418.GA10436@alvh.no-ip.org |
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Lists: | pgsql-general |
Tom Lane wrote:
> Greg Smith <greg(at)2ndquadrant(dot)com> writes:
> > Florian Weimer wrote:
> >> The sizes displayed by \dt+ in version 8.4.2 do not take TOAST tables
> >> into account, presumably because the pg_relation_size does not reflect
> >> that, either. I think this is a bit surprising. From a user
> >> perspective, these are part of the table storage (I understand that
> >> the indices might be a different story, but TOAST table are a fairly
> >> deep implementation detail and should perhaps be hidden here).
>
> > As of last week there's a new pg_table_size available that does what you
> > want here:
> > http://archives.postgresql.org/pgsql-committers/2010-01/msg00288.php
>
> > I don't believe \dt+ has been updated yet to use that though; that's
> > worth considering for a minute, not sure anybody thought about it yet.
>
> We could only use pg_table_size against a backend >= 9.0, which would
> mean that the displayed results mean something different depending on
> which backend version psql is being used with. That's not necessarily
> a deal-breaker, but it does seem a bit evil.
Perhaps we can emulate pg_table_size on earlier server versions, using a
query which provides the sum of table plus toast items. It would be a
bit slower, but the normal case of using the same server version would
be fast.
--
Alvaro Herrera http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.
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