HOW TO START ORACLE SERVICES AT SYSTEM BOOT

Database Autostartup Steps :

1> Make /etc/oratab file entry Y as :
 orcl:/u01/app/oracle/product/10.2.0/db_1:Y
2>Create a file called "/etc/rc.d/init.d/oracle" as the root user, containing the following.
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#!/bin/sh
# chkconfig: 345 99 10
# description: Oracle auto start-stop script.
#
# Set ORA_HOME to be equivalent to the $ORACLE_HOME
# from which you wish to execute dbstart and dbshut;
#
# Set ORA_OWNER to the user id of the owner of the 
# Oracle database in ORA_HOME.

ORA_HOME=/u01/app/oracle/product/10.2.0/db_1
ORA_OWNER=oracle

if [ ! -f $ORA_HOME/bin/dbstart ]
then
    echo "Oracle startup: cannot start"
    exit
fi

case "$1" in
    'start')
        # Start the Oracle databases:
        # The following command assumes that the oracle login 
        # will not prompt the user for any values
        su - $ORA_OWNER -c "$ORA_HOME/bin/lsnrctl start"
        su - $ORA_OWNER -c $ORA_HOME/bin/dbstart
        ;;
    'stop')
        # Stop the Oracle databases:
        # The following command assumes that the oracle login 
        # will not prompt the user for any values
        su - $ORA_OWNER -c $ORA_HOME/bin/dbshut
        su - $ORA_OWNER -c "$ORA_HOME/bin/lsnrctl stop"
        ;;
esac
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3>Use the chmod command to set the privileges to 755.
 chmod 755 /etc/rc.d/init.d/oracle

4>Associate the oracle service with the appropriate run levels and set it to auto-start using the following command.
 chkconfig --level 345 oracle on

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