How many parallel servers should I use?

Hello All,
I am in 10g and would like to create table as select. I am using NOLOGGING and PARALLEL. I notice, as I go on increasing the number of parallel servers, I cost of my statement reduces.
create table tmp_xyz NOLOGGING PARALLEL 12 as
SELECT ...
from ...
value of PARALLEL_min_SERVERS and PARALLEL_MAX_SERVERS parallel servers is 0 and 240 respectively.
I am doing this for a large data table migration; no user be working at the time.
I wonder how many parallel processes I should use?
Regards

Mosaq wrote:
I wonder how many parallel processes I should use? Each parallel process is used for doing I/O - the I/O load is what is parallelised. Each PX slave gets an I/O load (usually a rowid range that describes a range of physical row-on-disk addresses) to process.
So your question boils down to what the I/O capacity is of the I/O subsystem on that server. And this is pretty unique to a server and depends on just how the I/O layer looks like.

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How many parallel servers should I use?

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