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Don Burleson Blog 







dbms_scheduler.alter_running_chain Tips

Oracle Database Tips by Donald BurlesonSeptember 1, 2015

Question: I have stopped a running chain with the dbms_scheduler.stop_job procedure.  

sys.dbms_scheduler.stop_job (
job_name =>'zztop1',
force => true

 The problem is when I try to restart the job chain with dbms_scheduler.alter_running_chain, I get the error that there is no running job with this name.  

sys.dbms_scheduler.alter_running_chain('zzyop01', 's50', 'state', 'not_started');  

How do I stop a job chain and re-start the chain at the stopped job step?

Answer:  I would look at pausing the job step instead of stopping it . . .


Oracle has a great tool for suspending job chains via dbms_scheduler.alter_running_chain  "pause=true", which allows all steps in a job chain to stop and be re-started, at the point immediately after the last job step completes.

You can use dbms_scheduler.alter_running_chain  "pause=true" to suspend execution in many places in a job chain, and re-start the job chain at-will.  

If the dbms_scheduler.alter_running_chain  "pause=true" is set, the job will stop right after it has completed execution and "completed=false" remains set.  

Conversely, if  the dbms_scheduler.alter_running_chain  "pause=false" is set, the job will stop right after it has completed execution and "completed=true" remains set.  

This is why your call to set state = 'not started" with dbms_scheduler.alter_running_chain failed . . . 

Because the job was already stopped.  

When starting Oracle after an instance failure, Oracle will make a consistent database by applying undo logs for a in-flight transactions chain job steps.  

Remember that a job stops that were running at the time of the failure are marked as stopped and the chain continues processing at the point of the last completed chain step.  

You can have Oracle job chain steps restart automatically after a database recovery by using alter_chain directive to set the restart_on_recovery attribute to true for those steps.

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