Explanation:
You can define a SWITCH_TIME for a plan in the Resource Manager to reduce the impact of long running operations on other users without aborting the long running operations.
Incorrect Answers:
1: You cannot do this with CPU_PER_CALL limit.
3: You don’t need to use a batch job to check V$SESSION_LONGOPS for this purpose.
4: It can be done with a SWITCH_TIME for a plan in the Resource Manager, you don’t need to monitor V$SESSION_LONGOPS.
Reference:
OCP Oracle9i Database: New Features for Administrators, Daniel Benjamin, p. 122-129
Chapter 3: Manageability Enhancements

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