在oracle的OEM管理器中有可视化的日志,当我们手工清除archive目录下的文件后,这些记录并没有被我们从controlfile中清除掉,也就是oracle并不知道这些文件已经不存在了!这时候我们要做手工的清除的话,下面我经过实验,可以尝试这种方法: 1. 进入rman 2. connect target / 3. crosscheck archivelog all; 4. delete expired archivelog all; 这时候我们再去OEM中看就一定看不到,如果你的从来没有做过这个动作的话,我们可以比较从这个动作前的controlfile后动作后的controlfile的大小! ORACLE正确删除归档并回收空间的方法 ORACLE正确删除归档并回收空间的方法 一个ORACLE归档日志经常满,表现为/oraarchive 这个文件空间占用100%大家一定抱怨ORACLE为何没有归档维护工具,很多人直接删除了事,错了,ORACLE有,而且很智能,可以正确的删除归档和FLASHBACK,不过切记,ORACLE归档日志对于ORACLE的数据恢复和备份非常重要,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用户身份登录到数据库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里留下未管理的归档文件 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 database: 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
|