Oracle RMAN清除归档日志
1、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.arc
find /u02/database/GOBO1/archive/ -ctime +0 -delete
RMAN> crosscheck archivelog all
b、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
[python] 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 2013 Copyright (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.arc RMAN> delete archivelog until sequence 16; released channel: ORA_DISK_1 allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=1075 devtype=DISK List 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.arc Do you really want to delete the above objects (enter YES or NO) yes ...............