On Thu, Nov 05, 2009 at 10:41:54AM -0500, Scot Kreienkamp wrote:
> Here's the query in the sandbox:
> psql -U postgres -d rms-prod -c "explain select * from soldtrx"
> QUERY PLAN
> --------------------------------------------------------------------
> Seq Scan on soldtrx (cost=0.00..223459.51 rows=4833151 width=278)
> (1 row)
>
> Another strange thing I just found when composing this email... If I set
> limit 5 on the query it works on the soldtrx table, but if I don't set a
> limit it just hangs.
That's to be expected; it's trying to copy all 5 million rows into the
psql process and that'll take a while. I presume you weren't trying
a similar test on the original box as you'd have got exactly the same
thing. Running COUNT(*) on the table is probably a better way to make
sure you've got all the rows you'd expect in there as you'll only have
to copy a single row over to psql--it'll still take a while for PG to
churn through things though. iostat or vmstat are good tools to see what
the database box is doing while it's working.
--
Sam http://samason.me.uk/