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Don Burleson Blog 








Script to verify that Oracle database is running

Oracle Database Tips by Donald Burleson

Question:  I'm a UNIX shop and I need a shell script to constantly monitor my database.  If the database is down, I want to send an alert e-mail.

Answer:  I use a Korn shell script to monitor the Oracle background process and scripts to check of Oracle is accepting connections.  For more details, see the great book "Oracle Linux Commands", and get the Free Oracle Linux command poster:

This UNIX command will show the number of processes for your instance:

ps -ef|grep $ORACLE_SID|grep -v grep|grep -v ora_|wc ?l

Here is how to check if your database is running:

check_stat=`ps -ef|grep ${ORACLE_SID}|grep pmon|wc -l`;
oracle_num=`expr $check_stat`
if [ $oracle_num -lt 1 ]
exit 0

# Test to see if Oracle is accepting connections
$ORACLE_HOME/bin/sqlplus -s /<<! > /tmp/check_$ORACLE_SID.ora
  select * from v\$database;

# If not, exit and e-mail . . .
check_stat=`cat /tmp/check_$ORACLE_SID.ora|grep -i error|wc -l`;
oracle_num=`expr $check_stat`
if [ $oracle_num -ne 0 ]
  mailx -s "$ORACLE_SID is down!"
exit 16

This is just a snippet from Oracle database monitoring scripts that you can schedule with a cron.  More advanced Oracle monitoring scripts can also automatically attempt to re-start the failed instance or listener processes, but we recommend that you use well-tested script like those in the Oracle script collection.

If you like Oracle tuning, you may enjoy the new book "Oracle Tuning: The Definitive Reference", over 900 pages of BC's favorite tuning tips & scripts. 

You can buy it direct from the publisher for 30%-off and get instant access to the code depot of Oracle tuning scripts.



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Note: This Oracle documentation was created as a support and Oracle training reference for use by our DBA performance tuning consulting professionals.  Feel free to ask questions on our Oracle forum.

Verify experience! Anyone considering using the services of an Oracle support expert should independently investigate their credentials and experience, and not rely on advertisements and self-proclaimed expertise. All legitimate Oracle experts publish their Oracle qualifications.

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