Oracle 如何刪除歸檔日志文件

Oracle的OEM管理器中有可視化的日志展現(xiàn)出，當(dāng)我們手工清除archive目錄下的文件后，這些記錄并沒(méi)有被我們從controlfile中清除掉，也就是oracle并不知道這些文件已經(jīng)不存在了!這時(shí)候我們要做手工的清除的話(huà)，下面我經(jīng)過(guò)實(shí)驗(yàn)，可以嘗試這種方法：

1. 進(jìn)入rman 
2. connect target /
3. crosscheck archivelog all;-
 

4. delete expired archivelog all;
這時(shí)候我們?cè)偃EM中看就一定看不到，如果你的從來(lái)沒(méi)有做過(guò)這個(gè)動(dòng)作的話(huà)，我們可以比較從這個(gè)動(dòng)作前的controlfile后動(dòng)作后的controlfile的大小!

Oracle正確刪除歸檔并回收空間的方法

備份非常重要，不到萬(wàn)不得已不要?jiǎng)h除歸檔日志。
刪除歸檔日志的過(guò)程
以O(shè)racle用戶(hù)身份登錄到數(shù)據(jù)庫(kù)服務(wù)器主機(jī)或通過(guò)網(wǎng)絡(luò)連接
進(jìn)入Oracle數(shù)據(jù)備份工具
rman target/
或rman target/@orcl
在命令窗口里面執(zhí)行
DELETE ARCHIVELOG ALL COMPLETED BEFORE 'SYSDATE-7';
說(shuō)明
SYSDATA-7，表明當(dāng)前的系統(tǒng)時(shí)間7天前，before關(guān)鍵字表示在7天前的歸檔日志，如果使用了閃回功能，也會(huì)刪除閃回的數(shù)據(jù)。
同樣道理，也可以刪除從7天前到現(xiàn)在的全部日志，不過(guò)這個(gè)命令要考慮清楚，做完這個(gè)刪除，最好馬上進(jìn)行全備份數(shù)據(jù)庫(kù)
DELETE ARCHIVELOG FROM TIME 'SYSDATE-7';

UNIX/LINUX下也可以通過(guò)FIND找到7天前的歸檔數(shù)據(jù)，使用EXEC子操作刪除

find /oraarchive -xdev -mtime +7 -name "*.dbf" -exec rm -f {} ;
這樣做仍然會(huì)在RMAN里留下未管理的歸檔文件
仍需要在RMAN里執(zhí)行下面2條命令
crosscheck archivelog all;
delete expired archivelog all;
所以還不如上面的方法好用，不過(guò)用FIND的好處就是，可以在條件上，和EXEC子項(xiàng)上做很多操作，實(shí)現(xiàn)更復(fù)雜的功能

3.簡(jiǎn)要介紹一下report obsolete命令

使用report obsolete命令報(bào)告過(guò)期備份

RMAN> report obsolete;RMAN retention policy will be applied to the commandRMAN retention policy is set to redundancy 1Report of obsolete backups and copiesType                 Key    Completion Time    Filename/Handle-------------------- ------ ------------------ --------------------Backup Set           125    01-NOV-04Backup Piece       125    01-NOV-04          /data1/Oracle/orabak/full_1_541045804Backup Set           131    04-NOV-04Backup Piece       131    04-NOV-04          /data1/oracle/orabak/full_AVATAR2_20041104_131....Backup Set           173    06-DEC-04Backup Piece       173    06-DEC-04          /data1/oracle/orabak/full_AVATAR2_20041206_173Backup Set           179    11-DEC-04Backup Piece       179    11-DEC-04          /data1/oracle/orabak/arch544588206.arc.....Backup Piece       189    17-DEC-04          /data1/oracle/orabak/arch545106606.arcBackup Set           190    17-DEC-04Backup Piece       190    17-DEC-04          /data1/oracle/orabak/arch545106665.arcBackup Set           191    20-DEC-04Backup Piece       191    20-DEC-04          /data1/oracle/orabak/arch_AVATAR2_20041220_194Archive Log          2973   20-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2985.dbfArchive 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.dbfArchive Log          2704   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2716.dbfArchive Log          2703   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2715.dbfArchive Log          2702   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2714.dbf
 

4.使用delete obsolete命令刪除過(guò)期備份:

RMAN> delete obsolete;RMAN retention policy will be applied to the commandRMAN retention policy is set to redundancy 1using channel ORA_DISK_1Deleting the following obsolete backups and copies:Type                 Key    Completion Time    Filename/Handle-------------------- ------ ------------------ --------------------Backup Set           125    01-NOV-04Backup Piece       125    01-NOV-04          /data1/Oracle/orabak/full_1_541045804....Archive Log          2704   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2716.dbfArchive Log          2703   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2715.dbfArchive Log          2702   17-DEC-04          /opt/oracle/oradata/avatar2/archive/1_2714.dbfDo you really want to delete the above objects (enter YES or NO)? yesdeleted backup piecebackup piece handle=/data1/oracle/orabak/full_AVATAR2_20041206_173 recid=173 stamp=544156241.....deleted archive logarchive log filename=/opt/oracle/oradata/avatar2/archive/1_2715.dbf recid=2703 stamp=545108268deleted archive logarchive log filename=/opt/oracle/oradata/avatar2/archive/1_2714.dbf recid=2702 stamp=545107659Deleted 286 objectsRMAN> crosscheck archivelog all;released channel: ORA_DISK_1allocated channel: ORA_DISK_1channel ORA_DISK_1: sid=19 devtype=DISKspecification does not match any archive log in the recovery catalog
 

5 在rman中用crosscheck檢查歸檔日志,2個(gè)歸檔日志都是失敗的:
RMAN> crosscheck archivelog all;

釋放的通道: ORA_DISK_1
分配的通道: ORA_DISK_1
通道 ORA_DISK_1: sid=14 devtype=DISK
對(duì)歸檔日志的驗(yàn)證失敗
存檔日志文件名 =D:OracleORADATATESTARCHIVE1_47.DBF 記錄 ID=1 時(shí)間戳 =572866
683
對(duì)歸檔日志的驗(yàn)證失敗
存檔日志文件名 =D:OracleORADATATESTARCHIVE11_48.DBF 記錄 ID=2 時(shí)間戳 =57286
6931
已交叉檢驗(yàn)的 2 對(duì)象

6 試著同步一下,看行不行,結(jié)果不行,crosscheck還是失敗:
RMAN> resync catalog;

正在啟動(dòng)全部恢復(fù)目錄的 resync
完成全部 resync

RMAN> crosscheck archivelog all;

釋放的通道: ORA_DISK_1
分配的通道: ORA_DISK_1
通道 ORA_DISK_1: sid=14 devtype=DISK
對(duì)歸檔日志的驗(yàn)證失敗
存檔日志文件名 =D:OracleORADATATESTARCHIVE1_47.DBF 記錄 ID=1 時(shí)間戳 =572866
683
對(duì)歸檔日志的驗(yàn)證失敗
存檔日志文件名 =D:OracleORADATATESTARCHIVE11_48.DBF 記錄 ID=2 時(shí)間戳 =57286
6931
已交叉檢驗(yàn)的 2 對(duì)象

7 用list expired看看是否有失效的archive log,證明沒(méi)有失效的archive log:
RMAN> list expired archivelog all;

說(shuō)明與恢復(fù)目錄中的任何存檔日志均不匹配

8 更改語(yǔ)言環(huán)境試試,結(jié)果再次crosscheck,2個(gè)archive log 都成功了:
RMAN> exit

恢復(fù)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

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