Re: query not using index

>     explain select event_id from history where event_type = 120;
>     NOTICE:  QUERY PLAN:
>
>     Seq Scan on history  (cost=0.00..446079.00 rows=200000 width=8)
>
> even if I do a drop index history_idx, explains sais the same.
>

Try
    explain select event_id from history where event_type = 120::int8;

See
    http://fts.postgresql.org/db/mw/msg.html?mid=1031765
for some further explanation/history.

HTH,
-- Joe