Rodrigo,
> 3. My transaction log configuration are : checkpoint_segments = 3 and
> checkpoint_timeout = 300 and my transaction logs are on the same disk .
Well, you need to move your transaction logs to another disk, and increase
them to a large number ... like 128, which is about 1GB (you'll need that
much disk space). Also, increase the checkpoint_timeout to minimize
checkpointing during the load; like, 1500.
> I know that I can increase the performance separating the transaction
> logs and making a RAID 5 array
Actually, RAID5, unless you're using > 5 disks, would make things slower.
Speeding writes up through RAID would require at least 6 drives, and probably
RAID 1+0.
> BUT I am really curious about WHY this
> performance is so poor and HOW can I try to improve on this actual
> machine because actualy this inserts are taking around 90 minutes!!!
Are you doing INSERTS and not COPY? If so, are you batching them in
transactions?
--
Josh Berkus
Aglio Database Solutions
San Francisco