Alert mail script for checking oracle database up/down status

Step 1. create the shell script for checking dbstatus

vi /home/oracle/dbcheck.sh

#!/bin/bash
hostname=server1.soumya.com
oracle_sid=prim
export instance_name=ora_pmon_prim
status=`ps -ef |grep pmon | head -1 | awk '{print $8}'`
if [ "$status" == "$instance_name" ]; then
echo "DB IS UP"
else
echo "DB down"
mail -s "Attention!! $oracle_sid Database is Down at $hostname!! " yourmailid@gmail.com
fi
exit 0

:wq

Step 2. Schedule it for checkup in every 5 minutes
crontab -e
*/5 * * * * /home/oracle/dbcheck.sh > /dev/null

p.s.Make sure mailx rpm is installed and sendmail or other mail service is running on server.