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Don Burleson Blog 







Execute Simultaneous Synchronous Oracle Jobs

Expert Oracle Database Tips by Donald BurlesonMarch 21, 2015


Question:  I have two jobs that I want to execute at the same time, synchronously, and I need to know how to make the jobs start simultaneously. 

This code did not start the jobs at the same time:

dbms_job.submit(jobno1,'pc;', next_date=>SYSDATE);
dbms_job.submit(jobno2, 'pc2;', next_date=>SYSDATE);;;

How do I get many jobs to run simultaneously in Oracle?

Answer:  Whether you are using dbms_job or dbms_scheduler, when you submit many jobs at the same time, they will begin to execute simultaneously, unless you have configured the job scheduler to asynchronous mode.  

See my notes on manipulating SYSDATE for complex Oracle job scheduling.

The question is how to run ad-hoc jobs simultaneously or synchronously!

With vanilla SYSDATE, one job will start a few fractions of a second before the other job!

What you want is to make both jobs wait until the same time.

You might try the next minute and then see if the jobs start at the exact same time . . .

Try something like the following. I have not tried this code, but the concept is to add one minute to SYSDATE and then truncate the date format to minutes only.

Hopefully, something like this will force the jobs to submit at the same time . . .

next_date=>(SYSDATE,'mm/dd/yyyy hh24:mi')+((SYSDATE,'mm/dd/yyyy hh24:mi')+1)/24/60

Oracle allows for very complex date scheduling arithmetic, and I have complete references and working examples of submitting Oracle jobs here.  

For a complete treatment of job scheduling, see the book "Oracle Job Scheduling".   It has working code examples in the book code download.

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