When does new hardware help ?

Hello,
i'm working with a 9.2.0.5 db on a hpux server with 2 processors and 8 gb ram. usually during the day there are about 500 - 600 dedicated connections on that server.
Some "power" user's processes often consume about 25 % of one cpu for a few seconds up to one minute (they often have to do some kind of data loading)
Sometimes on this system the cpu idle times goes down close to zero for a few minutes, which results in very bad response time of the db.
Now i'm wondering if simply buying new hardware will help. I'm especially not sure if 2 processors are enougth for this amount of user sessions.
Is there some kind of white paper which explains how to size an oracle db server for unix ?
I have to add that i have no influence on the database design or the application that is using this database as its from a third party vendor.

>
i'm working with a 9.2.0.5 db on a hpux server with 2 processors and 8 gb ram. usually during the day there are about 500 - 600 dedicated connections on that server.
Some "power" user's processes often consume about 25 % of one cpu for a few seconds up to one minute (they often have to do some kind of data loading)
Sometimes on this system the cpu idle times goes down close to zero for a few minutes, which results in very bad response time of the db.
Now i'm wondering if simply buying new hardware will help. I'm especially not sure if 2 processors are enougth for this amount of user sessions.You might be able to take a look at pinning some types of work to
one processor - and the way things are going - you can set up fractions
of processors. Check out your OS capabilities.
I have to add that i have no influence on the database design or the application that is using this database as its from a third party vendor.Usual story. You could ask them if they've seen it before ("Yours is the only site we've had this kind of
problem...Sir...") - google extensively.
Paul...

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