Oracle Data Guard （RAC+DG) 归档删除策略及脚本

1、Data Guard 主库归档文件删除策略：

当我们设置：
RMAN>configure archivelog deletion policy to applied on standby;
在Maximum Availability和 Maximum
Performance下，RMAN备份归档文件的时候，加上delete input的时候，归档会被删除。
RMAN> configure archivelog deletion policy to none;
此时归档删除策略会被取消。

2、Data Guard 备库归档文件删除策略

此次备库的归档删除策略是在单机版的基础上进行升级，增加了日志功能，支持对2个节点RAC主库的归档文件在备库上删除的功能，可以作为计划任务执行也可以以交互的形式单独执行。
由于备库一般不执行rman备份计划，所以需要脚本删除这些归档日志文件。
[oracle@hainan backup_scripts]$ vim delstarch.sh

export ORACLE_THREAD=$1

export ORACLE_HOME=/u01/app/oracle/product/11.2.0/dbhome_1

export ORACLE_SID=bdspoc

export SHELL_DIR=/u01/app/oracle/backup_scripts

export DATE=$(date +%Y-%m-%d\ %H:%M:%S)

if [ ! $ORACLE_THREAD ];then

read -p "Enter deleted thread[1|2]: "

DB_THREAD=$REPLY

else

DB_THREAD=$ORACLE_THREAD

fi

if [ $DB_THREAD == 1 ];then

del_seq=`ls /arch|grep ^1|cut -f2 -d_|sort -n |head -1`

echo $del_seq "is the minimum archlog sequence"

$ORACLE_HOME/bin/sqlplus -s "sys/***** as sysdba" <<eof >$SHELL_DIR/max_sn.log

set head off;

set feedback;

select max(sequence#) from v\$log_history where THREAD#=1;
exit;

eof

max_sn=`cat /u01/app/oracle/backup_scripts/max_sn.log|awk '{print $1}'|grep ^[0-9]`

#保留最近的20个归档，其他都删除
max_sn=`expr $max_sn - 20`

echo $max_sn "is the maximum archlog sequence"

while [ $del_seq -lt $max_sn ]

do

DATE=$(date +%Y%m%d_%H%M%S)

rm /arch/1_"$del_seq"_816281825.arc
DATE=$(date +%Y-%m-%d\ %H:%M:%S)

#由于log_archive_format 为%t_%s_%r.arc类型，%r为resetlog id

echo "$DATE"  /arch/1_"$del_seq"_816281825.arc >> $SHELL_DIR/delarch.log

del_seq=`expr $del_seq + 1`

echo "$DATE"  1_"$del_seq"_816281825.arc

done

elif [ $DB_THREAD == 2 ];then

del_seq=`ls /arch|grep ^2|cut -f2 -d_|sort -n |head -1`

echo $del_seq "is the minimum archlog sequence"

$ORACLE_HOME/bin/sqlplus -s "sys/***** as sysdba" <<eof >$SHELL_DIR/max_sn.log

set head off;

set feedback;

select max(sequence#) from v\$log_history where upper(THREAD#)=2;

exit;

eof

max_sn=`cat /u01/app/oracle/backup_scripts/max_sn.log|awk '{print $1}'|grep ^[0-9]`

max_sn=`expr $max_sn - 20`

echo $max_sn "is the maximum archlog sequence"

while [ $del_seq -lt $max_sn ]

do

rm /arch/2_"$del_seq"_816281825.arc

DATE=$(date +%Y-%m-%d\ %H:%M:%S)

echo "$DATE"  /arch/2_"$del_seq"_816281825.arc >> $SHELL_DIR/delarch.log

echo "$DATE"  2_"$del_seq"_816281825.arc  has been deleted

del_seq=`expr $del_seq + 1`

done
else

echo "$DATE"  There has a fault db_thread value! >> $SHELL_DIR/delarch.log

fi

可以交互式执行，例如：

[oracle@hainan backup_scripts]$ sh delstarch.sh

Enter deleted thread[1|2]: 1 --选择删除从哪个节点归档来的日志文件

也可以做成计划任务执行该脚本

[oracle@hainan ~]# crontab -l

0 1 * * * /u01/app/oracle/backup_scripts/delstarch.sh 1

0 2 * * * /u01/app/oracle/backup_scripts/delstarch.sh 2

每天1点执行1节点归档来的日志文件，2点执行2节点归档来的日志文件。