转自 https://blog.51cto.com/8858975/1401988
监控脚本（注：这里没用Sendmail工具发送邮件，如果用的话需要修改）
$cat check_oracle_dg_delay.sh

#!/bin/sh
source ~/.bash_profile
#定义变量
v_datetime=`date +"%Y-%m-%d %H:%M:%S"`
v_username='oracle'
v_hostname=`hostname`
#获取IP地址
v_ip=`/sbin/ifconfig bond0|grep 'inet addr'|awk '{print $2}'|cut -d: -f2`
#发送人
v_sendmail='xxxxx@139.com'
#接收人,多个联系人用空格分开
v_receivemail='XXXXX@139.com XXXXX@163.com'
#路径
v_path="/home/${v_username}/scripts"
#####define tns#####
v_dbname='XXXXX'
v_standby_tns='xxxxx_dg'
#####报警阀值设置(单位：秒)#####
v_delay_time_warning=1800

#####Oracle DG 延时获取开始#####
sqlplus -S "/ as sysdba" <<EOF
--#####primary database####
col delay_time for 9999999999;
col tmp_delay_time new_val tmp_delay_time
set timing off time off verify off heading off trimout on trimspool on linesize 180;

spool ${v_path}/delay_time.log
select (to_date(to_char(scn_to_timestamp(current_scn),
'yyyy-mm-dd hh24:mi:ss'),
'yyyy-mm-dd hh24:mi:ss') -
to_date(to_char(scn_to_timestamp
((select current_scn
from v\$database@phystandby.localdomain)),
'yyyy-mm-dd hh24:mi:ss'),
'yyyy-mm-dd hh24:mi:ss')) * 24 * 3600 tmp_delay_time
from v\$database;
spool off;

spool ${v_path}/delay_scn_and_time.log
col standby_current_scn for 999999999999999;
col primary_current_scn for 999999999999999;
col standby_current_time for a30;
col primary_current_time for a30;
col delay_time for 9999999999;
set heading on
select current_scn primary_current_scn,
(select current_scn from v\$database@phystandby.localdomain) standby_current_scn,
to_char(scn_to_timestamp(current_scn), 'yyyy-mm-dd hh24:mi:ss') primary_current_time,
to_char(scn_to_timestamp
((select current_scn from v\$database@phystandby.localdomain)),
'yyyy-mm-dd hh24:mi:ss') standby_current_time,
(to_date(to_char(scn_to_timestamp(current_scn),
'yyyy-mm-dd hh24:mi:ss'),
'yyyy-mm-dd hh24:mi:ss') -
to_date(to_char(scn_to_timestamp
((select current_scn
from v\$database@phystandby.localdomain)),
'yyyy-mm-dd hh24:mi:ss'),
'yyyy-mm-dd hh24:mi:ss')) * 24 * 3600 "delay_time(s)"
from v\$database;
spool off;

exit
EOF
#####Oracle DG 延时获取结束#####

#####Oracle DG 延时时长提取#####
v_delay_time=`cat ${v_path}/delay_time.log|sed '/^$/d'|sed -e 's/[[:space:]][[:space:]]*/ /g'`
#####监控代码开始#####
if [ ${v_delay_time} -ge ${v_delay_time_warning} ] ; then

echo "############################" > ${v_path}/oracle_dg_delay.log
echo "USER: ${v_username}" >> ${v_path}/oracle_dg_delay.log
echo "HOSTNAME: ${v_hostname}" >> ${v_path}/oracle_dg_delay.log
echo "IP: ${v_ip}" >> ${v_path}/oracle_dg_delay.log
echo "############################" >> ${v_path}/oracle_dg_delay.log
cat ${v_path}/delay_scn_and_time.log >> ${v_path}/oracle_dg_delay.log
${v_path}/bsmtp -f ${v_sendmail} -h smtp.api.localdomain -s "${v_dbname} ORACLE DG DELAY ${v_delay_time}s WARNING!!! - ${v_datetime}" ${v_receivemail} < ${v_path}/oracle_dg_delay.log
fi
#####监控代码结束#####

2、配置crontab，每十分钟执行一次

$crontab -l

#oracle DG delay check
*/10 * * * * /home/oracle/scripts/check_oracle_dg_delay.sh >/dev/null 2>&1

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