A collections of questions on scheduling information

Hello, I am doing some research on QoS management, and I need much scheduling information. So I got some questions.
1 Based on the oracle scheduler, I want to design my own scheduler(non-preempt). That is, once a job is finished, the scheduler need to schedule new jobs based on some job information. So how can i design such a scheduler? I think it should be a job in the database, but it is neither periodic nor event-based.
2 Each time my scheduler runs, it probably schedule a same job to run. If the former instance of this job has not completed, the new instance will be skipped. How can I disable the former instance and let the new instance run?
3 I will configure a periodic job which will collect all of the statistic data at the beginning of each period. How can I read the duration time of each job which has been completed? I know I can read the duration time from ALL_SCHEDULER_JOB_RUN_DETAILS,but the accuracy of the duration time in that view is only second. I need better accuracy. Another problem is, if a job has completed several instances in the last period, how can i differentiate them from each other. Because all of the instance number is 1.
4 And also, I need to know how much CPU time all of the jobs in the last period have consumed. How can I know the cpu time of each instance of each job?(not only the jobs which have completed but also those jobs which are running.) (because I need add them together and write some algorithm to control it not exceed 80% of the period.)
I am sorry to put so many troublesome questions together. Hope somebody can give me some guidance. Thanks a lot.

Hi,
I'll try to answer some of these questions briefly.
1 Based on the oracle scheduler, I want to design my
own scheduler(non-preempt). That is, once a job is
finished, the scheduler need to schedule new jobs
based on some job information. So how can i design
such a scheduler? I think it should be a job in the
database, but it is neither periodic nor
event-based.The design of a new Scheduler is not something I can really advise on. Perhaps you could have it based on a master process which is a Scheduler job that runs frequently (once every minute or so).
2 Each time my scheduler runs, it probably schedule a
same job to run. If the former instance of this job
has not completed, the new instance will be skipped.
How can I disable the former instance and let the new
instance run? The Scheduler does not allow multiple instances of the same job to run. If you want multiple instances of your action to run you need to create a scheduler program and then you can have multiple jobs pointing to that program. Those jobs can happily run in parallel
3 I will configure a periodic job which will collect
all of the statistic data at the beginning of each
period. How can I read the duration time of each job
which has been completed? I know I can read the
duration time from ALL_SCHEDULER_JOB_RUN_DETAILS,but
the accuracy of the duration time in that view is
only second. I need better accuracy. Another problem
is, if a job has completed several instances in the
last period, how can i differentiate them from each
other. Because all of the instance number is 1.The jobs will have different requested_start_dates . To gain better accuracy you can use log_date-actual_start_date from the ALL_SCHEDULER_JOB_RUN_DETAILS view.
4 And also, I need to know how much CPU time all of
the jobs in the last period have consumed. How can I
know the cpu time of each instance of each job?(not
only the jobs which have completed but also those
jobs which are running.) (because I need add them
together and write some algorithm to control it not
exceed 80% of the period.)You can do this by querying both ALL_SCHEDULER_JOB_RUN_DETAILS and ALL_SCHEDULER_RUNNING_JOBS .
Hope this helps,
Ravi.

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I can see where attorneys may like a hypothetical situation as the one above: they could charge more billable hours! I doubt Adobe would like it, however.
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On Fri, 22 Oct 2004 11:28:38 GMT, Brian wrote:
> I am trying to confirm something. When configuring the schedule for the wake on lan service object, is this just for when this object will check for any policies for waking up the machines.
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