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

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