How to determine the load on the oracle server within a stored procedure?

Hi,
I have a subset of commands in my stored procedure that I would like to execute them only if there is not significant load on the database sever.
What would be the best way to measure the amount of load on my database server within a stored procedure?
Thank you,
Alan

It is not that easy.
This stored procedure is called by a job that runs every hour. Half of the stored procedure code are mission critical and must run by any means necessary! The second half must run right after the 1st one and is nice to do.
If I assign a lower priority it makes the situation worst, because then the job might take 3-4 hours and the same jobs run on top of each other over and over.
I just oversimplified the situation, The point is I prefer not to run the less important PLSQL code rather than assigning lower priority and stretch it over timeline. These hourly jobs are not Oracle jobs and cannot run on top of each other. Last time this happened and I had to kill 12 sessions! (12 jobs in 12 hour)
Trust me, estimating the load on the database server is the only solution.
When I say load on the server I mean the load resulted from other oracle sessions on the same database server. This server is a single instance Oracle 10g Enterprise on Solaris. All I need is just accessing to some meaningful counters.
Any help would be appreciated,
Alan

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