业务增长发展迅猛，归档日志增长太快，磁盘承受不了，所以准备做个定时清理归档日志的定时任务。
1、RM方式清理归档日志
清理归档日志，可以人为的删除已经归档好的日志文件，然后再调用rman里面RMAN> crosscheck archivelog all;来去数据库里面删除归档记录；也可以通过ram调用delete命令来删除归档日志。
2、使用rman清理归档日志
RMAN清除方式会自动清除磁盘上的归档日志文件，同时会释放控制文件中对应的归档日志的归档信息。
可以基于不同的条件来清除归档日志，如基于SCN，基于SEQUENCE，基于TIME等方式。
对于上述的三种方式又可以配合from,until,between .. and .. 等等子句来限定范围，方式灵活多变。
下面的命令用于校验归档日志的有效性，列出无效的归档日志，以及以何种方式清除归档日志，列出几种常用的:
DELETENOPROMPT ARCHIVELOG UNTIL TIME "TO_DATE('XXXX-XX-XX','YYYY-MM-DD')";
deletenoprompt archivelog until time "to_date('2016-09-14 18:00:00','YYYY-MM-DD')"
crosscheckarchivelog all;--->校验日志的可用性
listexpired archivelog all;--->列出所有失效的归档日志
deletearchivelog until sequence 16;--->删除log sequence为16及16之前的所有归档日志
deletearchivelog all completed before 'sysdate-7';--->删除系统时间7天以前的归档日志，不会删除闪回区有效的归档日志
deletearchivelog all completed before 'sysdate - 1';--->同上，1天以前的
deletearchivelog from time 'sysdate-1';--->注意这个命令，删除系统时间1天以内到现在的归档日志
deletenoprompt archivelog all completed before 'sysdate'; --->该命令清除当前所有的归档日志
deletenoprompt archivelog all completed before 'sysdate-0'; --->该命令清除当前所有的归档日志
deletenoprompt archivelog all; --->同上一命令
3、实现清理一个小时前的归档日志
执行命令：delete force archivelog all completed before 'sysdate-1/24';
验证执行过程。
（1）查看当前时间 [oracle@hch_test_121_90 ~]$ date Tue Oct 11 11:20:20 CST 2016 [oracle@hch_test_121_90 ~]$ （2）查看当前一个小时之前的归档日志，看到有一个o1_mf_1_2822_czrm1dj8_.arc，如下所示： [oracle@hch_test_121_90 ~]$ ll /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/ |more total 3181880 -rw-r----- 1 oracle oinstall 41340416 Oct 11 10:19 o1_mf_1_2822_czrm1dj8_.arc -rw-r----- 1 oracle oinstall 40434176 Oct 11 10:20 o1_mf_1_2823_czrm49l9_.arc -rw-r----- 1 oracle oinstall 41180160 Oct 11 10:22 o1_mf_1_2824_czrm76nd_.arc -rw-r----- 1 oracle oinstall 40340480 Oct 11 10:23 o1_mf_1_2825_czrm9xos_.arc RMAN> delete force archivelog all completed before 'sysdate-1/24'; using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=11 device type=DISK List of Archived Log Copies for database with db_unique_name POWERDES ===================================================================== Key Thrd Seq S Low Time ------- ---- ------- - --------- 1396 1 2822 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2822_czrm1dj8_.arc Do you really want to delete the above objects (enter YES or NO)? YES # 输入删除命令 deleted archived log archived log file name=/oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2822_czrm1dj8_.arc RECID=1396 STAMP=924949164 Deleted 1 objects RMAN> |
4、自动化脚本定时任务实现清理一个小时前的归档日志
（1）自动化脚本
[root@hch_test_121_90 ~]# more archivelog_clear.sh #!/bin/sh BACK_DIR=/oracle/clear_archlog/data export DATE=`date +%F` echo " " >> $BACK_DIR/$DATE/rman_backup.log echo `date '+%Y-%m-%d %H:%M:%S'` >> $BACK_DIR/$DATE/rman_backup.log su - oracle -c " mkdir -p $BACK_DIR/$DATE rman log=$BACK_DIR/$DATE/rman_backup.log target / <<EOF # delete force archivelog all completed before 'sysdate-1/24'; # 这里执行清除归档日志，如果不想手动输入YES，则可以添加noprompt参数 delete force noprompt archivelog all completed before 'sysdate-1/24'; exit; EOF " echo " " >> $BACK_DIR/$DATE/rman_backup.log [root@hch_test_121_90 ~]# |
（2）crontab定时任务
[root@hch_test_121_90 ~]# crontab -l 10 */1 * * * sh /home/oracle/archivelog_clear.sh [root@hch_test_121_90 ~]# |
（3）查看执行后的日志
[root@hch_test_121_90 ~]# more /oracle/clear_archlog/data/2016-10-11/rman_backup.log Recovery Manager: Release 11.2.0.1.0 - Production on Tue Oct 11 11:28:04 2016 Copyright (c) 1982,2009,Oracle and/or its affiliates. All rights reserved. connected to target database: POWERDES (DBID=3458668465) RMAN> using target database control file instead of recovery catalog allocated channel: ORA_DISK_1 channel ORA_DISK_1: SID=137 device type=DISK List of Archived Log Copies for database with db_unique_name POWERDES ===================================================================== Key Thrd Seq S Low Time ------- ---- ------- - --------- 1397 1 2823 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2823_czrm49l9_.arc 1398 1 2824 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2824_czrm76nd_.arc 1399 1 2825 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2825_czrm9xos_.arc 1400 1 2826 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2826_czrmdqqy_.arc 1401 1 2827 A 11-OCT-16 Name: /oracle/app/oracle/flash_recovery_area/POWERDES/archivelog/2016_10_11/o1_mf_1_2827_czrmhksn_.arc Do you really want to delete the above objects (enter YES or NO)? "exit;" is an invalid response - please re-enter. Do you really want to delete the above objects (enter YES or NO)? Error occurred getting response - assuming NO response RMAN> Recovery Manager complete. [root@hch_test_121_90 ~]# |
