Ini contohnya. Saya copy & paste aja ya

#!/usr/bin/ksh
# Created by Rohmad Feb 25, 2008
export ORACLE_HOME=/opt/oracle/product/10.2.0.2
export LOG=/opt/oracle/home/rohmad/cekdb.log
export LOGHIS=/opt/oracle/home/rohmad/cekdb`date "+%Y%m%d_%H%M%S"`.log
export DB=${1}

ReciptList="/usr/local/ADMIN/scripts/trigger_resync/recipient.lst"
SMSTo=`grep -v "#" $ReciptList | nawk '{print $2}' | tr "\012" "\040" | tr "\040" "\053"`
#SMSTo=08176551105
date1=$(date "+%H:%M:%S %d-%m-%Y")
MSG=0

$ORACLE_HOME/bin/sqlplus cek_dummy/cek_dummy@${DB} < < EOF > $LOG
EOF
cd /opt/oracle/home/rohmad
MSG=`grep “ORA-01017: invalid username/password; logon denied” cekdb.log|wc -l`
if [ $MSG = 1 ]
        then echo “Database ${DB} is Up”
             echo $MSG;
else
       echo  “Database ${DB} is down at ${date1}”
       echo $MSG;
       SMSMessage=”Database ${DB} is down at ${date1}”
       echo $SMSMessage >> $LOGHIS
       /usr/local/ADMIN/scripts/trigger_resync/sms.ksh ${SMSTo} ${SMSMessage}
fi

script ini saya jalankan di crontab, jalan setiap setengah jam sekali

6,36 * * * * /opt/oracle/home/rohmad/cekdb.sh MYDATABASE> /dev/null

Kalau anda familiar dengab shell script di UNIX, anda bisa menambahkan step untuk menaikkan database kalau down.