How do we determine the db writer process

Hi
How can we determine that number of DB WRITER process required for the database. At what basis we set the db writer process in a database. Can any one please explain in detail ?.
Thanks in advance.
Govind

Generally speaking, i don't think the count of db writer will be a bottleneck. I have a large and critical database over 200GB. It only has a db writer. The better way you should do is to perfrom Oracle statspack. It will help you to find out the bottleneck.
Eric

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