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I think you may be getting the same confusion that I had a few weeks back. (Check for answers to my question on RAID 5 on this newsgroup - it may help clarify matters)
I am new to Oracle, but I was clear with the concept of different files, etc on their own physical disks, e.g. log file members/groups, indexes, data, etc. Then I was confused because the use of RAID seemed to ignore all this completely.
The way I see things now, is that if you use RAID5, the recommendations for different physical disks for different Oracle things go down the drain - you cannot use both the Oracle best practices and RAID 5 at the same time. What I have learnt from this newsgroup is that RAID5 is not a good idea for Oracle databases, so I guess it is best to forget RAID5 for database systems, and instead use the concepts of splitting indexes, logs, etc.on different disks as recommended by Oracle.
I hope this helps. My answer may be a little fuzzy as I am still slowly getting the understanding of this myself.
K.
-- Posted from stan.gibnet.gi [195.166.192.3] via Mailgate.ORG Server - http://www.Mailgate.ORGReceived on Tue Jan 09 2001 - 09:26:27 CST