I am wondering if there is any way to limit how much resources one user can take on my Oracle system. I want to limit some queries and systems from being able to hog all system resources when they run non optimized queries.
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There is a built-in utility called Resource Manager exactly for that purpose: http://download.oracle.com/docs/cd/B19306_01/server.102/b14231/dbrm.htm#i1010776
If you're looking for something simpler than the resource manager, try Profiles.
I haven't had much success with the resource manager. In my experience with it I've found that it's easier to give priority over resources to certain users than to limit users.