Oracle RMAN 清除归档日志

在开发环境及UAT环境经常碰到需要清除归档日志的情形，对于这个问题方法有很多。可以直接使用rm方式清除归档日志，也可以使用find命令来查找符合条件的记录来清除归档日志，或者直接写个shell脚本来搞定。这样在DEV或者UAT还可以，但是在Prod环境还是建议使用RMAN提供的命令来搞定比较妥当。因为rm，find方式删除了实际的归档日志也释放了空间，但对应的存储在控制文件中的归档信息并没有彻底清除。依旧占用着一些空间未能及时清除而需要控制文件通过age out方式来释放空间。本文描述了使用RMAN方式来清除归档日志，同时也可以将其部署到shell脚本中使用。有关阅读本文需要的相关参考Oracle 归档日志 http://www.linuxidc.com/Linux/2011-03/33070.htmOracle 控制文件（CONTROLFILE） http://www.linuxidc.com/Linux/2011-03/33069.htmOracle 联机重做日志文件（ONLINE LOG FILE） http://www.linuxidc.com/Linux/2011-03/33068.htmLinux/Unix shell 脚本中调用SQL,RMAN脚本 http://www.linuxidc.com/Linux/2012-09/70310.htmLinux/Unix shell 脚本清除归档日志文件 http://www.linuxidc.com/Linux/2013-04/82808.htm1、清除归档日志的方式a、手动删除使用rm 或者find方式来删除，通过该方式删除之后，在RMAN下可以通过 crosscheck archivelog all 校验归档是否失效，如下面的操作:rm -rf arch_816906485_1_10.arcfind /u02/database/GOBO1/archive/ -ctime +0 -deleteRMAN> crosscheck archivelog allb、使用RMAN方式清除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:crosscheck archivelog all; --->校验日志的可用性list expired archivelog all; --->列出所有失效的归档日志delete archivelog until sequence 16; --->删除log sequence为16及16之前的所有归档日志delete archivelog 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delete archivelog all completed before "sysdate - 1"; --->同上，1天以前的delete archivelog 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delete noprompt archivelog all completed before "sysdate"; --->该命令清除所有的归档日志delete noprompt archivelog all; --->同上一命令2、演练使用RMAN清除归档日志robin@SZDB:~> export ORACLE_SID=GOBO1
robin@SZDB:~> rman target /Recovery Manager: Release 10.2.0.3.0 - Production on Thu Jul 11 17:07:00 2013Copyright （c） 1982, 2005, Oracle. All rights reserved.connected to target database: GOBO1 （DBID=733951103）RMAN> host;robin@SZDB:~> cd /u02/database/GOBO1/archive/
robin@SZDB:/u02/database/GOBO1/archive> ls
arch_816906485_1_10.arc arch_816906485_1_12.arc
arch_816906485_1_11.arc arch_816906485_1_13.arc
............robin@SZDB:/u02/database/GOBO1/archive> rm -rf arch_816906485_1_10.arc arch_816906485_1_11.arc arch_816906485_1_12.arc
robin@SZDB:/u02/database/GOBO1/archive> exit;
exit
host command complete

RMAN> crosscheck archivelog all;
released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISK
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_9.arc recid=2085 stamp=817211151
validation failed for archived log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_10.arc recid=2086 stamp=817250793
..............
validation succeeded for archived log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_90.arc recid=2166 stamp=820458049
Crosschecked 83 objects RMAN> list expired archivelog all;List of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2086 1 10 X 20130604 11:05:51 /u02/database/GOBO1/archive/arch_816906485_1_10.arc
2087 1 11 X 20130604 22:06:17 /u02/database/GOBO1/archive/arch_816906485_1_11.arc
2088 1 12 X 20130605 19:30:53 /u02/database/GOBO1/archive/arch_816906485_1_12.arcRMAN> delete archivelog until sequence 16;released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISKList of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2084 1 8 A 20130604 09:53:17 /u02/database/GOBO1/archive/arch_816906485_1_8.arc
.................
2092 1 16 A 20130607 22:03:23 /u02/database/GOBO1/archive/arch_816906485_1_16.arcDo you really want to delete the above objects （enter YES or NO）？ yes
...............
deleted archive log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_16.arc recid=2092 stamp=817516861
Deleted 9 objectsRMAN> delete archivelog all completed before "sysdate-7";released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISKList of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2093 1 17 A 20130608 00:01:00 /u02/database/GOBO1/archive/arch_816906485_1_17.arc
2094 1 18 A 20130608 18:00:17 /u02/database/GOBO1/archive/arch_816906485_1_18.arc
...........
deleted archive log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_72.arc recid=2148 stamp=819847035
Deleted 56 objects RMAN> list copy of database archivelog all;
List of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2149 1 73 A 20130703 23:17:13 /u02/database/GOBO1/archive/arch_816906485_1_73.arc
2150 1 74 A 20130704 22:00:19 /u02/database/GOBO1/archive/arch_816906485_1_74.arc
2151 1 75 A 20130704 22:04:40 /u02/database/GOBO1/archive/arch_816906485_1_75.arc
...............
2164 1 88 A 20130709 23:19:34 /u02/database/GOBO1/archive/arch_816906485_1_88.arc
2165 1 89 A 20130710 13:00:34 /u02/database/GOBO1/archive/arch_816906485_1_89.arc
2166 1 90 A 20130710 22:02:44 /u02/database/GOBO1/archive/arch_816906485_1_90.arcRMAN> delete archivelog from time "sysdate-1";released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISKList of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2165 1 89 A 20130710 13:00:34 /u02/database/GOBO1/archive/arch_816906485_1_89.arc
2166 1 90 A 20130710 22:02:44 /u02/database/GOBO1/archive/arch_816906485_1_90.arcDo you really want to delete the above objects （enter YES or NO）？ yes
deleted archive log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_89.arc recid=2165 stamp=820447373
deleted archive log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_90.arc recid=2166 stamp=820458049
Deleted 2 objectsRMAN> delete archivelog all completed before "sysdate - 1";released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISKList of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2149 1 73 A 20130703 23:17:13 /u02/database/GOBO1/archive/arch_816906485_1_73.arc
.......................
2164 1 88 A 20130709 23:19:34 /u02/database/GOBO1/archive/arch_816906485_1_88.arcDo you really want to delete the above objects （enter YES or NO）？ yes
................
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_88.arc recid=2164 stamp=820414835
Deleted 16 objectsRMAN> sql " alter system archive log current";sql statement: alter system archive log currentRMAN> list copy of archivelog all;
List of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2167 1 91 A 20130711 01:00:48 /u02/database/GOBO1/archive/arch_816906485_1_91.arcRMAN> delete noprompt archivelog all completed before "sysdate";released channel: ORA_DISK_1
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=1075 devtype=DISKList of Archived Log Copies
Key Thrd Seq S Low Time Name
------- ---- ------- - ----------------- ----
2167 1 91 A 20130711 01:00:48 /u02/database/GOBO1/archive/arch_816906485_1_91.arc
deleted archive log
archive log filename=/u02/database/GOBO1/archive/arch_816906485_1_91.arc recid=2167 stamp=820517964
Deleted 1 objects

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