撤消表空間資料檔案丟失的恢復.

昨天又碰到一例.

歸檔模式,沒有冷/熱備份.

一般來說這種情況下把資料檔案offline drop然後開啟資料庫exp資料即可.

這次開啟資料庫的時候出錯:

Errors in file /home/oracle/admin/ora9i/udump/ora9i_ora_1882.trc:
ORA-00604: error occurred at recursive SQL level 2
ORA-00376: file 2 cannot be read at this time
ORA-01110: data file 2: '/data1/oradata/ora9i/undotbs01.dbf'
Wed Sep 29 12:39:23 2004
Error 604 happened during db open, shutting down database
USER: terminating instance due to error 604
Instance terminated by USER, pid = 1882
ORA-1092 signalled during: alter database open...

後來,把隱含引數加上才可以開啟資料庫.

不過資料丟失應該是必然的了.如果資料量很大的話,新建庫imp也會比較痛苦.

備份一定要做好.