I did a vacuum analyze before I run the following explain
June_03=# explain select * from tmp where route >>='62.1.1.0/24'; QUERY PLAN
----------------------------------------------------------------Seq Scan on tmp (cost=0.00..606.60 rows=14544
width=33) Filter: (route >>= '62.1.1.0/24'::cidr)
(2 rows)
The select returns just one route,
Thanks
[email protected] (Josh Berkus) wrote in message news:<[email protected]>...
> Georgos,
>
> > select * from tmp where route >>= some_cidr
>
> Can you post an EXPLAIN ANALYZE for this? And when's the last time you ran
> ANALYZE on the table?
>
> > The index on route is not used and I get a sequential scan. The index is
> > used only for the <<= operator.
>
> Most likely Postgres thinks that the >>= query is returning 60% of your table,
> which makes indexes useless.
>
> --
> Josh Berkus
> Aglio Database Solutions
> San Francisco
>
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