使用shell脚本实现对Oracle数据库的监控与管理将大大简化DBA的工作负担，如常见的对实例的监控，监听的监控，告警日至的监控，以及数据库的备份，AWR report的自动邮件等。本文给出Linux 下使用 shell 脚本来监控 Oracle 实例。

    Linux Shell的相关参考：
        Linux/Unix shell 脚本中调用SQL,RMAN脚本
        Linux/Unix shell sql 之间传递变量
        Linux Unix shell 调用 PL/SQL

1、监控Oracle实例shell脚本

  robin@SZDB:~/dba_scripts/custom/bin> more ck_inst.sh   
  # +-------------------------------------------------------+
  # +    CHECK INSTANCE STATUS AND SEND MAIL                |
  # +    Author : Robinson                                  |
  # +    Blog   : http://blog.csdn.net/robinson_0612        |
  # +    Desc:                                              |
  # +         variable X_DB use to exclude some instance    | 
  # +-------------------------------------------------------+
  
  #!/bin/bash
  
  # --------------------------------------------
  # Set environment vairable and define variable
  # --------------------------------------------
  
  if [ -f ~/.bash_profile ]; then
      . ~/.bash_profile
  fi
  
  ORATAB=/etc/oratab
  TIMESTAMP=`date +%Y%m%d%H%M`    
  MAILPATH=/users/robin/dba_scripts/sendEmail-v1.56
  LOG_DIR=/users/robin/dba_scripts/custom/log             
  LOG_FILE=${LOG_DIR}/ck_inst_$TIMESTAMP.log 
  DBALIST="robinson.cheng@12306.com;robinson_0612@12306.com"
  X_DB='SYBO2SZ|CNQDII|CNFO'
  RETENTION=1
  
  # ----------------------
  # Check instance status
  # ----------------------
  
  if [ -z "$X_DB" ]; then
      X_DB='DUMMY'
  fi
  {
  echo "`date` " 
  echo "Oracle Database(s) Status on `hostname`" 
  echo "-----------------------------------------" 
  db=`egrep -i ":Y|:N" $ORATAB | cut -d":" -f1 | grep -v "\#" | grep -v "\*"` 
  pslist=`ps -ef | grep pmon | grep -v grep`
  dblist=`for i in $db; do echo $i; done | grep -vP $X_DB`
  for i in $dblist; do 
      echo "$pslist" | grep "[oa]*_pmon_$i" > /dev/null 2>&1 
      if (( $? )); then 
          echo "Oracle Instance - $i: Down" 
      else 
          echo "Oracle Instance - $i: Up" 
      fi
  done;
  }|tee -a ${LOG_FILE} 2>&1
  
  # ------------------------
  # Send Email
  # ------------------------
  
  cnt=`cat $LOG_FILE | grep Down | wc -l`
  if [ "$cnt" -gt 0 ]; then
      $MAILPATH/sendEmail -f szdb@2gotrade.com -t $DBALIST -u "Instance status on `hostname`" -o message-file=$LOG_FILE 
  fi
  
  # ------------------------------------------------
  # Removing files older than $RETENTION parameter 
  # ------------------------------------------------
  
  find ${LOG_DIR} -name "ck_inst*.*" -mtime +$RETENTION -exec rm {} \;
  
  exit
  
  robin@SZDB:~/dba_scripts/custom/bin> ./ck_inst.sh 
  Fri Feb  1 15:10:41 CST 2013 
  Oracle Database(s) Status on SZDB
  -----------------------------------------
  Oracle Instance - CNBO1: Up
  Oracle Instance - CNBOTST: Down
  Oracle Instance - CNMMBO: Up
  Oracle Instance - MMBOTST: Up
  Oracle Instance - CNMMBOBK: Down
  Oracle Instance - CI8960U: Up
  Oracle Instance - CNBO2: Up
  Feb 01 15:10:41 szdb sendEmail[16024]: Email was sent successfully!

2、补充
  a、上面的脚本根据/etc/oratab中列出的实例进行监控，可以监控多个实例。
  b、变量X_DB用于排除那些不需要监控的实例，如脚本中排出了3个实例。也可以将该变量置空。
  c、如果X_DB的值为空时，我们赋予了DUMMY，确保你的数据库实例名没有使用DUMMY，否则过滤不掉。
  d、监控脚本在监控过程中只要有