Re: How often do I need to reindex tables?

This select doesn't return any row. What does it mean ?

Ezequias.

2007/2/27, Jim C. Nasby <jim(at)nasby(dot)net>:
> On Tue, Feb 27, 2007 at 11:26:02AM -0800, Dhaval Shah wrote:
> > I am planning to use 8.2 and the average inserts/deletes and updates
> > across all tables is moderate. That is, it is a moderate sized
> > database with moderate usage of tables.
> >
> > Given that, how often do I need to reindex the tables? Do I need to do
> > it everyday?
>
> No, you should very rarely if ever need to do it.
>
> If you're really concerned, I suggest monitoring average tuples per
> index page; something like
>
> SELECT relname, reltuples/relpages FROM pg_class WHERE relkind = 'i' AND
> relpages > 1000;
>
> That'll show tuples/page for all indexes over 8MB in size.
>
> > Also with 8.2, I do not have to do vacuum anymore or that is what I
> > understand. Does it do auto-vacuum?
>
> You still need to enable autovacuum. See autovacuum_enable.
> --
> Jim Nasby jim(at)nasby(dot)net
> EnterpriseDB http://enterprisedb.com 512.569.9461 (cell)
>
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>

--
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Atenciosamente (Sincerely)
Ezequias Rodrigues da Rocha
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A pior das democracias ainda é melhor do que a melhor das ditaduras
The worst of democracies is still better than the better of dictatorships
http://ezequiasrocha.blogspot.com/