The following Unix shell scripts can be used to automate the Data Guard Switchover process of a physical standby database.
It is very important that the scripts are run in the correct order and on right machine.
These scripts are based on a few customisations. The *.sh scripts are located in a directory called “/var/opt/oracle/dataguard” and there is another file called “set$ORACLE_SID” which is located under “/var/opt/oracle/cronjobs”. This script sets the environment for the individual Oracle instance like the $ORACLE_SID and the $ORACLE_HOME.
On the machine where the Primary Database is running we need to run the following scripts
$ cd /var/opt/oracle/dataguard
$ ./pre_switchover_check.sh
$ ./make_me_standby.sh
On the machine where the Standby Database is running we need to run the following script:
$ cd /var/opt/oracle/dataguard
$ ./make_me_primary.sh
After the switchover is completed, we need to run the following script on the machine where the former Primary (now new Standby) database is running:
$ cd /var/opt/oracle/dataguard
$ ./start_recovery.sh
pre_switchover_check.sh
!/bin/ksh
if [ "$1" = "" ]
then
echo ""
echo "##################################################################"
echo "# PLEASE ENTER ORACLE_SID AS THE FIRST COMMAND LINE ARGUMENT #"
echo "# SCRIPT USAGE : pre_switchover_check.sh #"
echo "##################################################################"
echo ""
exit
fi
ORACLE_SID=`echo $1 |tr '[A-Z]' '[a-z]'`; export ORACLE_SID;
ls -l /var/opt/oracle/cronjobs/set$ORACLE_SID > /dev/null
if [ $? != 0 ]
then
echo ""
echo "##################################################################"
echo "# ENVIRONMENT SETTING SET FILE NOT FOUND...!!! #"
echo "# /var/opt/oracle/cronjobs/set$ORACLE_SID #"
echo "##################################################################"
echo ""
exit
fi
. /var/opt/oracle/cronjobs/set$ORACLE_SID
DB=`echo $1 |tr '[a-z]' '[A-Z]'`; export DB;
echo ""
echo "##################################################################"
echo "# PERFORMING PRE-SWITCHOVER CHECKS FOR $DB #"
echo "##################################################################"
echo ""
sqlplus -s /nolog |&
print -p "connect / as sysdba"
print -p "set feedback off pause off pagesize 0 heading off verify off linesize 500 term off "
print -p "set sqlprompt ''"
read -p JUNK
print -p "SELECT DATABASE_ROLE DBROLE FROM V\$DATABASE;"
read -p DBROLE
print -p "SELECT COUNT(FILE#) FILESTAT FROM V\$DATAFILE WHERE STATUS IN ('RECOVER', 'OFFLINE');"
read -p FILESTAT
print -p "SELECT COUNT(FILE#) BKPSTAT FROM V\$BACKUP WHERE STATUS = 'ACTIVE';"
read -p BKPSTAT
print -p "SELECT LOG_ARCHIVED-LOG_APPLIED LOGGAP
FROM (SELECT MAX(SEQUENCE#) LOG_ARCHIVED
FROM V\$ARCHIVED_LOG WHERE DEST_ID=1 AND ARCHIVED='YES'
AND RESETLOGS_CHANGE#=(SELECT MAX(RESETLOGS_CHANGE#)
FROM V\$ARCHIVED_LOG)),
(SELECT MAX(SEQUENCE#) LOG_APPLIED
FROM V\$ARCHIVED_LOG WHERE DEST_ID=2
AND APPLIED='YES'
AND RESETLOGS_CHANGE#=(SELECT MAX(RESETLOGS_CHANGE#) FROM V\$ARCHIVED_LOG)) ;"
read -p LOGGAP
print -p "EXIT"
echo "CHECKING CURRENT DATABASE ROLE..."
if [ "$DBROLE" = "PHYSICAL STANDBY" ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! NOT A PRIMARY DATABASE, PLEASE RUN IT ON PRIMARY #"
echo "##################################################################"
echo ""
exit
else
echo ""
echo " OK "
echo ""
fi
echo "CHECKING LOG GAP BETWEEN PRIMARY & STANDBY..."
if [ $LOGGAP -ne 0 ]
then
echo ""
echo "######################################################################"
echo "# ERROR ! ! ! PRIMARY & STANDBY ARE NOT IN SYNC, LOG GAP = $LOGGAP #"
echo "######################################################################"
echo ""
exit
else
echo ""
echo " OK "
echo ""
fi
echo "CHECKING FILES OFFLINE OR RECOVER STATUS..."
if [ $FILESTAT -ne 0 ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! ONE OR MORE FILE/S OFFLINE OR IN RECOVER STATUS #"
echo "##################################################################"
echo ""
exit
else
echo ""
echo " OK "
echo ""
fi
echo "CHECKING FILES IN BACKUP MODE..."
if [ $BKPSTAT -ne 0 ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! ONE OR MORE FILE/S ARE IN BACKUP MODE #"
echo "##################################################################"
echo ""
exit
else
echo ""
echo " OK "
echo ""
fi
echo ""
echo "##################################################################"
echo "# ALL PRE-SWITCHOVER CHECKS SUCCEEDED... PROCEED WITH SWITCHOVER #"
echo "##################################################################"
echo ""
make_me_standby.sh
#!/bin/ksh
if [ "$1" = "" ]
then
echo ""
echo "##################################################################"
echo "# PLEASE ENTER ORACLE_SID AS THE FIRST COMMAND LINE ARGUMENT #"
echo "# SCRIPT USAGE : make_me_standby.sh #"
echo "##################################################################"
echo ""
exit
fi
ORACLE_SID=`echo $1 |tr '[A-Z]' '[a-z]'`; export ORACLE_SID;
ls -l /var/opt/oracle/cronjobs/set$ORACLE_SID > /dev/null
if [ $? != 0 ]
then
echo ""
echo "##################################################################"
echo "# ENVIRONMENT SETTING SET FILE NOT FOUND...!!! #"
echo "# /var/opt/oracle/cronjobs/set$ORACLE_SID #"
echo "##################################################################"
echo ""
exit
fi
. /var/opt/oracle/cronjobs/set$ORACLE_SID
DB=`echo $1 |tr '[a-z]' '[A-Z]'`; export DB;
sqlplus -s /nolog |&
print -p "connect / as sysdba"
print -p "set feedback off pause off pagesize 0 heading off verify off linesize 500 term off"
print -p "set sqlprompt ''"
read -p JUNK
print -p "SELECT DATABASE_ROLE DBROLE FROM V\$DATABASE;"
read -p DBROLE
print -p "SELECT COUNT(FILE#) FILESTAT FROM V\$DATAFILE WHERE STATUS IN ('RECOVER', 'OFFLINE');"
read -p FILESTAT
print -p "SELECT COUNT(FILE#) BKPSTAT FROM V\$BACKUP WHERE STATUS = 'ACTIVE';"
read -p BKPSTAT
print -p "SELECT LOG_ARCHIVED-LOG_APPLIED LOGGAP
FROM (SELECT MAX(SEQUENCE#) LOG_ARCHIVED
FROM V\$ARCHIVED_LOG WHERE DEST_ID=1 AND ARCHIVED='YES'
AND RESETLOGS_CHANGE#=(SELECT MAX(RESETLOGS_CHANGE#)
FROM V\$ARCHIVED_LOG)),
(SELECT MAX(SEQUENCE#) LOG_APPLIED
FROM V\$ARCHIVED_LOG WHERE DEST_ID=2
AND APPLIED='YES'
AND RESETLOGS_CHANGE#=(SELECT MAX(RESETLOGS_CHANGE#) FROM V\$ARCHIVED_LOG)) ;"
read -p LOGGAP
print -p "EXIT"
if [ "$DBROLE" = "PHYSICAL STANDBY" ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! NOT A PRIMARY DATABASE, PLEASE RUN IT ON PRIMARY #"
echo "##################################################################"
echo ""
exit
fi
if [ $LOGGAP -ne 0 ]
then
echo ""
echo "######################################################################"
echo "# ERROR ! ! ! PRIMARY & STANDBY ARE NOT IN SYNC, LOG GAP = $LOGGAP #"
echo "######################################################################"
echo ""
exit
fi
echo "CHECKING FILES OFFLINE OR RECOVER STATUS..."
if [ $FILESTAT -ne 0 ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! ONE OR MORE FILE/S OFFLINE OR IN RECOVER STATUS #"
echo "##################################################################"
echo ""
exit
fi
if [ $BKPSTAT -ne 0 ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! ONE OR MORE FILE/S ARE IN BACKUP MODE #"
echo "##################################################################"
echo ""
exit
fi
echo ""
echo "##################################################################"
echo "# ALL PRE-SWITCHOVER CHECKS SUCCEEDED... #"
echo " SWITCHING $DB TO STANDBY ROLE, PLEASE CONFIRM ... "
echo "##################################################################"
echo ""
echo ""
echo "Continue? - Please enter 'Y' to proceed & 'N' to exit"
read ans
if [ "$ans" = 'Y' -o "$ans" = 'y' ]
then
sqlplus -s /nolog < /tmp/make_me_standby.log
connect / as sysdba;
startup force;
alter database commit to switchover to standby with session shutdown;
shutdown immediate;
startup nomount;
alter database mount standby database;
select database_role from v\$database;
EOF
cat /tmp/make_me_standby.log
$ORACLE_HOME/bin/lsnrctl stop PRIMARY_$DB
else
echo "Quitting ....."
exit
fi
echo ""
echo "####################################################################"
echo "# PLEASE CONFIRM THAT THE STATUS OF DATABASE IS NOW "STANDBY" #"
echo "# #"
echo "# On OLD STANDBY Host please run the following script: #"
echo "# /var/opt/oracle/dataguard/make_me_primary.sh #"
echo "####################################################################"
echo ""
make_me_primary.sh
#!/bin/ksh
if [ "$1" = "" ]
then
echo ""
echo "##################################################################"
echo "# PLEASE ENTER ORACLE_SID AS THE FIRST COMMAND LINE ARGUMENT #"
echo "# SCRIPT USAGE : make_me_primary.sh #"
echo "##################################################################"
echo ""
exit
fi
ORACLE_SID=`echo $1 |tr '[A-Z]' '[a-z]'`; export ORACLE_SID;
ls -l /var/opt/oracle/cronjobs/set$ORACLE_SID > /dev/null
if [ $? != 0 ]
then
echo ""
echo "##################################################################"
echo "# ENVIRONMENT SETTING SET FILE NOT FOUND...!!! #"
echo "# /var/opt/oracle/cronjobs/set$ORACLE_SID #"
echo "##################################################################"
echo ""
exit
fi
. /var/opt/oracle/cronjobs/set$ORACLE_SID
DB=`echo $1 |tr '[a-z]' '[A-Z]'`; export DB;
sqlplus -s /nolog |&
print -p "connect / as sysdba"
print -p "set feedback off pause off pagesize 0 heading off verify off linesize 500 term off"
print -p "set sqlprompt ''"
read -p JUNK
print -p "SELECT DATABASE_ROLE DBROLE FROM V\$DATABASE;"
read -p DBROLE
print -p "exit"
if [ "$DBROLE" = "PRIMARY" ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! NOT STANDBY DATABASE, PLEASE RUN IT ON STANDBY #"
echo "##################################################################"
echo ""
exit
fi
echo ""
echo "##################################################################"
echo "# SWITCHING $DB TO PRIMARY ROLE, PLEASE CONFIRM ... #"
echo "##################################################################"
echo ""
echo "Continue? - Please enter 'Y' to proceed & 'N' to exit"
read ans
if [ "$ans" = 'Y' -o "$ans" = 'y' ]
then
sqlplus -s /nolog < /tmp/make_me_primary.log
connect / as sysdba;
alter database commit to switchover to primary with session shutdown;
shutdown immediate;
startup mount;
alter system set log_archive_dest_state_2=enable scope=both;
alter database set standby database to maximize performance;
alter database open;
select database_role from v\$database;
EOF
cat /tmp/make_me_primary.log
$ORACLE_HOME/bin/lsnrctl start PRIMARY_$DB
else
echo "Quitting ....."
exit
fi
echo "####################################################################"
echo "# PLEASE CONFIRM THAT THE STATUS OF DATABASE IS NOW "PRIMARY" #"
echo "# #"
echo "# On NEW STANDBY Host please run the following script: #"
echo "# /var/opt/oracle/dataguard/start_recovery.sh #"
echo "####################################################################"
start_recovery.sh
#!/bin/ksh
if [ "$1" = "" ]
then
echo ""
echo "##################################################################"
echo "# PLEASE ENTER ORACLE_SID AS THE FIRST COMMAND LINE ARGUMENT #"
echo "# SCRIPT USAGE : start_recovery.sh #"
echo "##################################################################"
echo ""
exit
fi
ORACLE_SID=`echo $1 |tr '[A-Z]' '[a-z]'`; export ORACLE_SID;
ls -l /var/opt/oracle/cronjobs/set$ORACLE_SID > /dev/null
if [ $? != 0 ]
then
echo ""
echo "##################################################################"
echo "# ENVIRONMENT SETTING SET FILE NOT FOUND...!!! #"
echo "# /var/opt/oracle/cronjobs/set$ORACLE_SID #"
echo "##################################################################"
echo ""
exit
fi
. /var/opt/oracle/cronjobs/set$ORACLE_SID
DB=`echo $1 |tr '[a-z]' '[A-Z]'`; export DB;
sqlplus -s /nolog |&
print -p "connect / as sysdba"
print -p "set feedback off pause off pagesize 0 heading off verify off linesize 500 term off"
print -p "set sqlprompt ''"
read -p JUNK
print -p "SELECT DATABASE_ROLE DBROLE FROM V\$DATABASE;"
read -p DBROLE
print -p "exit"
if [ "$DBROLE" = "PRIMARY" ]
then
echo ""
echo "##################################################################"
echo "# ERROR ! ! ! NOT STANDBY DATABASE, PLEASE RUN IT ON STANDBY #"
echo "##################################################################"
echo ""
exit
fi
echo ""
echo "##################################################################"
echo "# STARTING RECOVERY FOR $DB STANDBY, PLEASE CONFIRM ... #"
echo "##################################################################"
echo ""
echo "Continue? - Please enter 'Y' to proceed & 'N' to exit"
read ans
if [ "$ans" = 'Y' -o "$ans" = 'y' ]
then
sqlplus -s /nolog < /tmp/start_recovery.log
connect / as sysdba;
recover managed standby database disconnect;
alter system set log_archive_dest_state_2=defer scope=both;
EOF
cat /tmp/start_recovery.log
ps -ef | grep ora_mrp0_$ORACLE_SID |grep -v grep > /dev/null
if [ $? != 0 ]
then
echo ""
echo "##################################################################"
echo "# RECOVERY PROCESS NOT RUNNING... PLEASE CHECK #"
echo "##################################################################"
echo ""
exit
else
echo "##################################################################"
echo "# MRP PROCESS SUCESSFULLY STARTED #"
echo "##################################################################"
echo ""
echo "####################################################################"
echo "# SWITCHOVER COMPLETE #"
echo ""
echo "* Perform Database Post-Switchover Checklist! "
echo "####################################################################"
fi
else
echo "Quitting ....."
exit
fi
