Posted by graham.parsons on 02/07/06 14:31

Guys,

Hopefully someone can help.

We have a monitoring program that has threads which start and stop
monitoring at various times. There are two tables:

THREADLIFECYCLE

unique_id
start_time (always populated)
end_time (not populated until the thread ends)


MONITORRESULTS

unique_id
time_of_measurement
value


What I am trying to do is find the average value for each of the
numbers of running threads. To explain further, threads will start,
stop independently and overlap each other.

I want an output that says:

When 1 thread was running: average value was x
When 3 threads were running: average value was y

Due to the start and stop nature there could be 1 thread running at the
beginning of the test, mid way through, a number of occassions, etc.

Also, the number of threads does not necessarily ramp sequantially -
the number running at any time could be like this sequence: 1, 5, 10,
7, 12, 4, 2

ANY help would be much appreciated - it really has stumped me but looks
like it should be so simple .... But aren't they always the hard ones
;-(

Thanks

Graham

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