From: David Wall <d.wall@computer.org>
To: pgsql-performance@postgresql.org
Subject: Re: DB size and TABLE sizes don't seem to add up
Date: Tue, 18 Feb 2014 09:48:50 -0800
Message-ID: <53039D02.6010107@computer.org> (raw)
In-Reply-To: <53031B18.5060103@vmware.com>
References: <530289D4.20106@computer.org>
<53031B18.5060103@vmware.com>
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On 2/18/2014 12:34 AM, Heikki Linnakangas wrote:
> On 02/18/2014 12:14 AM, David Wall wrote:
>> I am running PG 9.2.4 and I am trying to figure out why my database size
>> shows one value, but the sum of my total relation sizes is so much less.
>>
>> Basically, I'm told my database is 188MB, but the sum of my total
>> relation sizes adds up to just 8.7MB, which is 1/20th of the reported
>> total. Where is the 19/20th of my data then? We do make significant
>> use of large objects, so I suspect it's in there. Is there a relation
>> size query that would include the large object data associated with any
>> OIDs in those tables?
>
> You can use "select pg_total_relation_size('pg_largeobject')" to get
> the total size of the large objects. Attributing large objects to the
> tables that refer them is more difficult. For a single table,
> something like this:
>
> select sum(pg_column_size(lo.data))
> from lotest_stash_values t, pg_largeobject lo
> where lo.loid = t.loid;
>
> Replace "lotest_stash_values" with the table's name and lo.loid with
> the name of the OID column.
Thanks, Heikki. It's generally even trickier for us because we have a
blob table that other components use for storing
large/binary/unstructured objects (the code handles
compression/decompression and encryption/decryption options for us). So
those tables have an UUID that points to a row in that table that
contains the actual LOID. I'll use your technique to at least tell me
the size for specific tables where I can build the query like you've
described.
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To: pgsql-performance@postgresql.org
Cc: d.wall@computer.org
Subject: Re: DB size and TABLE sizes don't seem to add up
In-Reply-To: <53039D02.6010107@computer.org>
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