LINUX如何删除归档日志文件

ORACLE正确删除归档并回收空间的方法

非常重要，不到万不得已不要删除归档日志。
删除归档日志的过程
以ORACLE用户身份登录到服务器主机或通过网络连接
进入ORACLE数据备份工具
rman target/
或rman target/@orcl
在命令窗口里面执行
DELETE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE-7';
说明
SYSDATA-7，表明当前的系统时间7天前，before关键字表示在7天前的归档日志，如果使用了闪回功能，也会删除闪回的数据。
同样道理，也可以删除从7天前到现在的全部日志，不过这个命令要考虑清楚，做完这个删除，最好马上进行全备份数据库
DELETE ARCHIVELOG FROM TIME 'SYSDATE-7';

UNIX/LINUX下也可以通过FIND找到7天前的归档数据，使用EXEC子操作删除

find /oraarchive -xdev -mtime +7 -name "*.dbf" -exec rm -f {} ;
这样做仍然会在RMAN里留下未的归档文件
仍需要在RMAN里执行下面2条命令
crosscheck archivelog all;
delete expired archivelog all;
所以还不如上面的方法好用，不过用FIND的好处就是，可以在条件上，和EXEC子项上做很多操作，实现更复杂的功能

3.简要介绍一下report obsolete命令

使用report obsolete命令报告过期备份

RMAN> report obsolete; RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 Report of obsolete backups and copies Type Key Completion Time Filename/Handle -------------------- ------ ------------------ -------------------- Backup Set 125 01-NOV-04 Backup Piece 125 01-NOV-04 /data1/oracle/orabak/full_1_541045804 Backup Set 131 04-NOV-04 Backup Piece 131 04-NOV-04 /data1/oracle/orabak/full_AVATAR2_20041104_131 .... Backup Set 173 06-DEC-04 Backup Piece 173 06-DEC-04 /data1/oracle/orabak/full_AVATAR2_20041206_173 Backup Set 179 11-DEC-04 Backup Piece 179 11-DEC-04 /data1/oracle/orabak/arch544588206.arc ..... Backup Piece 189 17-DEC-04 /data1/oracle/orabak/arch545106606.arc Backup Set 190 17-DEC-04 Backup Piece 190 17-DEC-04 /data1/oracle/orabak/arch545106665.arc Backup Set 191 20-DEC-04 Backup Piece 191 20-DEC-04 /data1/oracle/orabak/arch_AVATAR2_20041220_194 Archive Log 2973 20-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2985.dbf Archive Log 2971 20-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2984.dbf ..... Archive Log 2705 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2717.dbf Archive Log 2704 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2716.dbf Archive Log 2703 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2715.dbf Archive Log 2702 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2714.dbf

4.使用delete obsolete命令删除过期备份:

RMAN> delete obsolete; RMAN retention policy will be applied to the command RMAN retention policy is set to redundancy 1 using channel ORA_DISK_1 Deleting the following obsolete backups and copies: Type Key Completion Time Filename/Handle -------------------- ------ ------------------ -------------------- Backup Set 125 01-NOV-04 Backup Piece 125 01-NOV-04 /data1/oracle/orabak/full_1_541045804 .... Archive Log 2704 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2716.dbf Archive Log 2703 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2715.dbf Archive Log 2702 17-DEC-04 /opt/oracle/oradata/avatar2/archive/1_2714.dbf Do you really want to delete the above objects (enter YES or NO)? yes deleted backup piece backup piece handle=/data1/oracle/orabak/full_AVATAR2_20041206_173 recid=173 stamp=544156241 ..... deleted archive log archive log filename=/opt/oracle/oradata/avatar2/archive/1_2715.dbf recid=2703 stamp=545108268 deleted archive log archive log filename=/opt/oracle/oradata/avatar2/archive/1_2714.dbf recid=2702 stamp=545107659 Deleted 286 objects RMAN> crosscheck archivelog all; released channel: ORA_DISK_1 allocated channel: ORA_DISK_1 channel ORA_DISK_1: sid=19 devtype=DISK specification does not match any archive log in the recovery catalog

5 在rman中用crosscheck检查归档日志,2个归档日志都是失败的:
RMAN> crosscheck archivelog all;

释放的通道: ORA_DISK_1
分配的通道: ORA_DISK_1
通道 ORA_DISK_1: sid=14 devtype=DISK
对归档日志的验证失败
存档日志文件名 =D:ORACLEORADATATESTARCHIVE1_47.DBF 记录 ID=1 时间戳 =572866
683
对归档日志的验证失败
存档日志文件名 =D:ORACLEORADATATESTARCHIVE11_48.DBF 记录 ID=2 时间戳 =57286
6931
已交叉检验的 2 对象

6 试着同步一下,看行不行,结果不行,crosscheck还是失败:
RMAN> resync catalog;

正在启动全部恢复目录的 resync
完成全部 resync

RMAN> crosscheck archivelog all;

释放的通道: ORA_DISK_1
分配的通道: ORA_DISK_1
通道 ORA_DISK_1: sid=14 devtype=DISK
对归档日志的验证失败
存档日志文件名 =D:ORACLEORADATATESTARCHIVE1_47.DBF 记录 ID=1 时间戳 =572866
683
对归档日志的验证失败
存档日志文件名 =D:ORACLEORADATATESTARCHIVE11_48.DBF 记录 ID=2 时间戳 =57286
6931
已交叉检验的 2 对象

7 用list expired看看是否有失效的archive log,证明没有失效的archive log:
RMAN> list expired archivelog all;

说明与恢复目录中的任何存档日志均不匹配

8 更改语言环境试试,结果再次crosscheck,2个archive log 都成功了:
RMAN> exit

恢复管理器完成。

C:>set nls_lang=american_america.zhs16gbk

C:>rman catalogrman/rman@safetarget /

Recovery Manager: Release 9.2.0.1.0 - Production

Copyright (c) 1995, 2002, Oracle Corporation. All rights reserved.

connected to target : TEST (DBID=1870953724)
connected to recovery catalog database

RMAN> crosscheck archivelog all;

allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=9 devtype=DISK
validation succeeded for archived log
archive log filename=D:ORACLEORADATATESTARCHIVE1_47.DBF recid=1 stamp=57286
6683
validation succeeded for archived log
archive log filename=D:ORACLEORADATATESTARCHIVE11_48.DBF recid=2 stamp=5728
66931
Crosschecked 2 objects