Decommission v1

 #!/bin/bash


# Check if ORACLE_SID is provided

if [ -z "$1" ]; then

  echo "Error: ORACLE_SID not provided."

  echo "Usage: $0 <ORACLE_SID>"

  exit 1

fi


# Set environment variables using oraenv

export ORAENV_ASK=NO

export ORACLE_SID=$1


oraenv


LOG_FILE="decommission_$ORACLE_SID.log"


log() {

  local message=$1

  echo "$(date +'%Y-%m-%d %H:%M:%S') $message" | tee -a $LOG_FILE

}


log "Decommissioning process started for ORACLE_SID: $ORACLE_SID"


db_unique_name=$(sqlplus -s / as sysdba <<EOF

set heading off

set feedback off

set pagesize 0

select db_unique_name from v\$database;

exit;

EOF

)


db_unique_name=$(echo $db_unique_name | xargs) # trim spaces


log "Retrieved database unique name: $db_unique_name"


# Helper function to execute SQL commands

run_sql() {

  sqlplus -s "/ as sysdba" <<EOF

$1

exit;

EOF

}


# Helper function to execute DGMGRL commands and capture output

run_dgmgrl() {

  dgmgrl -silent <<EOF

connect /

$1

EOF

}


log "Capturing Data Guard configuration using DGMGRL"

run_dgmgrl "show configuration;" 2>&1 | tee -a $LOG_FILE


# Check if Data Guard is available

if grep -qE "ORA-16525|ORA-16596" $LOG_FILE; then

  log "Data Guard is not available for ORACLE_SID: $ORACLE_SID"

  exit 1

fi


log "Stopping the database: $db_unique_name"

# Stop the database

srvctl stop database -d $db_unique_name 2>&1 | tee -a $LOG_FILE


log "Creating PFILE from SPFILE"

# Create a PFILE from the SPFILE

run_sql "CREATE PFILE='/tmp/init${ORACLE_SID}.ora' FROM SPFILE;" 2>&1 | tee -a $LOG_FILE


log "Executing database drop sequence"

run_sql "

  ALTER SYSTEM SET cluster_database=FALSE SCOPE=SPFILE sid='+';

  STARTUP MOUNT;

  ALTER SYSTEM SET use_large_pages=TRUE SCOPE=SPFILE sid='*';

  SHUTDOWN IMMEDIATE;

  STARTUP MOUNT EXCLUSIVE RESTRICT;

  DROP DATABASE;

" 2>&1 | tee -a $LOG_FILE


log "Removing the database from SRVCTL configuration"

# Remove the database from SRVCTL

srvctl remove database -d $db_unique_name -f 2>&1 | tee -a $LOG_FILE


log "Cleaning up remaining files and directories"

rm -rf $ORACLE_HOME/dbs/init${ORACLE_SID}.ora 2>&1 | tee -a $LOG_FILE

rm -rf $ORACLE_BASE/diag/rdbms/$ORACLE_SID 2>&1 | tee -a $LOG_FILE

rm -rf /u01/app/oracle/admin/$ORACLE_SID/adump 2>&1 | tee -a $LOG_FILE


log "Updating listener.ora and oratab to remove database entries"

cp $ORACLE_HOME/network/admin/listener.ora $ORACLE_HOME/network/admin/listener.ora.bkp.$(date +%F) 2>&1 | tee -a $LOG_FILE

cp $ORACLE_HOME/network/admin/tnsnames.ora $ORACLE_HOME/network/admin/tnsnames.ora.bkp.$(date +%F) 2>&1 | tee -a $LOG_FILE

sed -i "/$ORACLE_SID/d" $ORACLE_HOME/network/admin/listener.ora 2>&1 | tee -a $LOG_FILE


cp /etc/oratab /tmp/oratab.bkp.$(date +%F) 2>&1 | tee -a $LOG_FILE

sed "/$ORACLE_SID/d" /tmp/oratab.bkp.$(date +%F) > /tmp/oratab.new 2>&1 | tee -a $LOG_FILE

mv /tmp/oratab.new /etc/oratab 2>&1 | tee -a $LOG_FILE


log "Removing ASM directories associated with the database"

asmcmd <<EOF 2>&1 | tee -a $LOG_FILE

cd +DATA

rm -rf $db_unique_name

cd +RECO

rm -rf $db_unique_name

EOF


log "Database $db_unique_name has been successfully decommissioned."

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