Re: Question about a CIDR based query - Mailing list pgsql-sql

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

josh@agliodbs.com (Josh Berkus) wrote in message news:<200406250900.08312.josh@agliodbs.com>...
> 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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