From: Guillaume Lelarge <guillaume@lelarge.info>
To: AI Rumman <rummandba@gmail.com>
Cc: pgsql-performance@postgresql.org
Subject: Re: REINDEX not working for wastedspace
Date: Wed, 21 Sep 2011 09:06:59 +0200
Message-ID: <1316588819.2001.0.camel@localhost.localdomain> (raw)
In-Reply-To: <CAGoODpcBxGLyF=bY3_5opO4YckgJqFGwBxveU_cYsrXBbN4NgQ@mail.gmail.com>
References: <CAGoODpcBxGLyF=bY3_5opO4YckgJqFGwBxveU_cYsrXBbN4NgQ@mail.gmail.com>
On Wed, 2011-09-21 at 13:01 +0600, AI Rumman wrote:
> I am using Postgresql 9.0.1.
>
> Using the query http://wiki.postgresql.org/wiki/Show_database_bloat, I got
> the following result for a table:
>
> -[ RECORD 1 ]----+-----------------------------------------------
> current_database | crm
> schemaname | public
> tablename | _attachments
> tbloat | 0.9
> wastedbytes | 0
> iname | attachments_description_type_attachmentsid_idx
> ibloat | 2.3
> wastedibytes | 5439488
> -[ RECORD 2 ]----+-----------------------------------------------
> current_database | crm
> schemaname | public
> tablename | _attachments
> tbloat | 0.9
> wastedbytes | 0
> iname | attachments_attachmentsid_idx
> ibloat | 0.2
> wastedibytes | 0
> -[ RECORD 3 ]----+-----------------------------------------------
> current_database | crm
> schemaname | public
> tablename | _attachments
> tbloat | 0.9
> wastedbytes | 0
> iname | _attachments_pkey
> ibloat | 0.2
> wastedibytes | 0
>
> I REINDEXED both the indexes and table, but I did not find any change in
> wastedspace or wastedispace.
> Could you please tell me why?
REINDEX only rebuilds indexes. And you'll obviously have a bit of "lost
space" because of the FILLFACTOR value (90% on indexes IIRC).
--
Guillaume
http://blog.guillaume.lelarge.infohttp://www.dalibo.com
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To: pgsql-performance@postgresql.org
Cc: guillaume@lelarge.info, rummandba@gmail.com
Subject: Re: REINDEX not working for wastedspace
In-Reply-To: <1316588819.2001.0.camel@localhost.localdomain>
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