檢視資料庫是否處於歸檔模式，開啟資料庫熱備模式，拷貝作業系統資料庫資料檔案到備份目錄
sys@prod> archive log list
database log mode archive mode
automatic archival enabled
oldest online log sequence 2
next log sequence to archive 4
current log sequence 4
sys@prod> alter database begin backup;
database altered.
sys@prod> host
[oracle@enmoedu1 prod]$ rm -rf /home/oracle/bak/*
[oracle@enmoedu1 prod]$ cp *.dbf /home/oracle/bak
[oracle@enmoedu1 prod]$ exit
exit
sys@prod> alter database end backup；
database altered.
sys@prod> host
[oracle@enmoedu1 prod]$ rm -rf *.dbf
[oracle@enmoedu1 prod]$ ll
total 172652
-rw-r----- 1 oracle oinstall 9748480 jan 2422:
50 control01.ctl
-rw-r----- 1 oracle oinstall 9748480 jan 2422:
50 control02.ctl
-rw-r----- 1 oracle oinstall 52429312 jan 2422:
50 redo01.log
-rw-r----- 1 oracle oinstall 52429312 jan 2422:
41 redo02.log
-rw-r----- 1 oracle oinstall 52429312 jan 2422:
41 redo03.log
[oracle@enmoedu1 prod]$
sys@prod>
shutdown immediate;
database closed.
database dismounted.
oracle instance shut down.
sys@prod>
startup
oracle instance started.
total system global area 835104768 bytes
fixed size 2257840 bytes
variable size 536874064 bytes
database buffers 289406976 bytes
redo buffers 6565888 bytes
database mounted.
ora-01157: cannot identify/lock data file 1 - see dbwr trace file
sys@prod>
[oracle@enmoedu1 prod]$ cp /home/oracle/bak/*.dbf ./ ——拷貝資料檔案到以前的資料檔案目錄
[oracle@enmoedu1 prod]$ exit
exit
sys@prod> select open_mode from v$database;
open_mode
--------------------
mounted
sys@prod> alter database open——嘗試開啟資料庫，報錯
2 ;
alter database open
*error at line 1:
ora-01113: file 1 needs media recovery
sys@prod>
recover database;——恢復資料庫
media recovery complete.
sys@prod>
alter database open;——開庫
database altered.
sys@prod>
select status from v$instance;
status
------------
open
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