#!/bin/bash 
##===========================================================
##   backup.rman.sh               
##   created by McDull Zeng          
##   2012-10-25
##   usage: backup.rman.sh <$BACKUP_LEVEL> 
##          BACKUP_LEVEL:  
##             A: archived log 
##             F: full backup 
##             0: level 0 
##             1: level 1                           
##
##
##   crontab under oracle user:
##      30 0 * * 0           /home/oracle/script/backup.rman.sh 0
##      30 0 * * 1,2,3,4,5,6 /home/oracle/script/backup.rman.sh 1
##============================================================ 


#====================================================================== 
# User specific environment
if [ -f ~/.bash_profile ];  
then 
  . ~/.bash_profile 
fi 
RMAN_DIR=/data/oracle/u02/rmanbackup;         export RMAN_DIR       
TIMESTAMP=`date +%Y%m%d_%H%M`;                export TIMESTAMP      
DATE=`date +%Y%m%d`;                          export DATE           
RETENTION=3;                                  export RETENTION
export RMAN_LEVEL 
# default level
if [ $# == 1 ];then
    RMAN_LEVEL=${1}
else
    RMAN_LEVEL="F"
fi
#====================================================================== 
# Check rman level  
if [ "$RMAN_LEVEL" == "F" ]; 
then  unset INCR_LVL 
    BACKUP_TYPE=full 
else 
    INCR_LVL="INCREMENTAL LEVEL ${RMAN_LEVEL}" 
    BACKUP_TYPE=lev${RMAN_LEVEL}  
fi 
RMAN_FILE=${RMAN_DIR}/${TIMESTAMP}_${BACKUP_TYPE};       export RMAN_FILE 


#====================================================================== 
#Check RMAN Backup Path 
if ! test -d ${RMAN_DIR} 
then 
    mkdir -p ${RMAN_DIR} 
fi 
#====================================================================== 
# query db role and whether it is a Data Guard enviroment
DB_INFO=`${ORACLE_HOME}/bin/sqlplus -s / as sysdba<   set pages 0
  set head off
  set feed off
    select d.database_role || '|' || l.standby_count || '|' as db_info
      from (select d.database_role from v\\$database d) d,
           (select count(1) as standby_count
              from v\\$archived_log l
             where l.standby_dest = upper('YES')
               and rownum = 1) l
     where rownum = 1;
EOF`
DB_ROLE=`echo ${DB_INFO} | awk -F'|' '{print $1}'`
HAS_STANDBY=`echo ${DB_INFO} | awk -F'|' '{print $2}'`
# echo "DB ROLE = ${DB_ROLE}"
# echo "HAS Stamdby = ${HAS_STANDBY}"
# Configuration should only be set on Primary
#============================================================================= 
if [ "${DB_ROLE}" = "PRIMARY" ];then
    RMAN_CFG="
    CONFIGURE RETENTION POLICY TO RECOVERY WINDOW OF ${RETENTION} DAYS; 
    CONFIGURE BACKUP OPTIMIZATION ON; 
    CONFIGURE CONTROLFILE AUTOBACKUP ON; 
    CONFIGURE CONTROLFILE AUTOBACKUP FORMAT FOR DEVICE TYPE DISK TO '${RMAN_FILE}_ctl_%F';   
    "
else
    RMAN_CFG="";
fi
# echo "RMAN Config = ${RMAN_CFG}"
# Delete Input Archived Log should only be set on a non Data Guard Primary
# Note: As for Data Guard, archived log is deleted by another script
#============================================================================= 
if [ "${DB_ROLE}" = "PRIMARY" -a "${HAS_STANDBY}" = "0" ];then
    DEL_INPUT="DELETE INPUT";
else
    DEL_INPUT="";
fi   
# echo "Del Input = ${DEL_INPUT}"
# RMAN Command
#============================================================================= 
if [ "$RMAN_LEVEL" == "A" ]; then
    RMAN_CMD="
    BACKUP AS COMPRESSED BACKUPSET
    ARCHIVELOG ALL FORMAT '${RMAN_FILE}_arc_%s_%p_%c'
    ${DEL_INPUT}
    ; 
    "
else
    RMAN_CMD="
    BACKUP AS COMPRESSED BACKUPSET
    ${INCR_LVL} 
    DATABASE FORMAT '${RMAN_FILE}_dat_%s_%p_%c'
    PLUS ARCHIVELOG FORMAT '${RMAN_FILE}_arc_%s_%p_%c'
    ${DEL_INPUT}
    ;     
    "
fi
# echo "RMAN Command =  ${RMAN_CMD} "
#Startup rman to backup  
#============================================================================= 
${ORACLE_HOME}/bin/rman log=${RMAN_FILE}.log < connect target / 
run { 
${RMAN_CFG}
ALLOCATE CHANNEL 'ch1' TYPE DISK maxpiecesize=4G; 
ALLOCATE CHANNEL 'ch2' TYPE DISK maxpiecesize=4G; 
CROSSCHECK ARCHIVELOG ALL; 
DELETE NOPROMPT EXPIRED ARCHIVELOG ALL; 
${RMAN_CMD}
DELETE NOPROMPT OBSOLETE; 
RELEASE CHANNEL ch1; 
RELEASE CHANNEL ch2; 
} 
exit; 
EOF 
RC=$?
#
exit