I think that the problem is the GROUP BY (datetime) that is
date_trunc('hour'::text, i.entry_time)
You should create an indexe with this expression (if its possible).
http://www.postgresql.org/docs/7.4/interactive/indexes-expressional.html
If is not possible, I would create a column with value
date_trunc('hour'::text, i.entry_time) of each row and then index it.
Hope this helps :)
Doron Baranes wrote:
>Hi,
>
>I am running on postgres 7.4.6.
>I did a vacuum analyze on the database but there was no change.
>I Attached here a file with details about the tables, the queries and
>the Explain analyze plans.
>Hope this can be helpful to analyze my problem
>
>10x
>Doron
>
>
>------------------------------------------------------------------------
>
>
>---------------------------(end of broadcast)---------------------------
>TIP 9: In versions below 8.0, the planner will ignore your desire to
> choose an index scan if your joining column's datatypes do not
> match
>
>
