Re: REINDEX not working for wastedspace - Mailing list pgsql-performance

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.info
 http://www.dalibo.com