How much RAM?

Hello list :)

I wonder if there is any possibility to calculate the estimated amount of RAM needed for an Oracle instance to run smoothly. To be explicit, I have a 2-node Oracle 10g RAC running on SuSE Linux, with 4 CPUs and 8 GB RAM each. There are already four instances installed each of which equally uses 2GB RAM. For the machines are avg. 80% idle (rather small databases, few users), we are thinking about adding another two instances to the RAC which have a total of about 200 (~130 + ~70)users together. So, can I somehow figure out how much the basic usage for one instance is plus a variable amount depending on the number of users?

Any help appreciated - hints, infos, links etc.

Thanks in advance!

Cheers,

Steiermärkische Gebietskrankenkasse
A-8011 Graz, Josef-Pongratz-Platz 1, http://www.stgkk.at

Nora Bernhard
OE Informationstechnologie - Systemadministration Tel: +43 (0) 316 8035 - 1349
Fax: +43 (0) 316 8035 - 661349
mailto:nora.bernhard_at_stgkk.sozvers.at

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