Sometimes, a daemon process (a constantly running process, like
an Oracle listener) may fail, and when a daemon process fails, a job
is required to keep it running.
I write code that runs on a cron every 5 minutes to see if the
daemon is running, and if not, start it. See here:
#**************************************************************
# Check if daemon called checkmymail is running . . . .
#**************************************************************
oracle_up=`ps -ef|grep
checkmymail|grep -v grep|wc -l`;
oracle_num=`expr $oracle_up`
if [ $oracle_num -lt 1 ]
then nohup
/u01/mtscripts/checkmymail >2&1 &
fi
For more on scheduling UNIX jobs, see the Dr. Tim Hall book “Oracle
Job Scheduling”
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