控制文件和數據文件完好，日誌文件全部丟失，正常關機，不需備份，數據不丟

控制文件和數據文件完好，日誌文件全部丟失，正常關機，不需備份，數據不丟

-----------------控制文件和數據文件完好，日誌文件全部丟失，正常關機，不需備份，數據不丟-------------------

-----------------------------------------模擬日誌文件全部丟失------------------------------------
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - 64bit Production
With the Partitioning, OLAP and Data Mining options
[oracle@station ~]$ reset
[oracle@station ~]$ sqlplus /nolog

SQL*Plus: Release 10.2.0.1.0 - Production on Fri Jun 8 12:52:53 2012

Copyright (c) 1982, 2005, Oracle.  All rights reserved.

SQL> conn /as sysdba
Connected.
SQL> create table hr.strom (a number) tablespace users;

Table created.

SQL> alter system switch logfile;

System altered.

SQL> insert into hr.strom values(1);

1 row created.

SQL> alter system switch logfile;

System altered.

SQL> commit;

Commit complete.

SQL> alter system switch logfile;

System altered.

SQL> insert into hr.strom values(2);

1 row created.

SQL> alter system switch logfile;

System altered.

SQL> commit;

Commit complete.

SQL> insert into hr.strom values(3);

1 row created.

SQL> commit;

Commit complete.

SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> !
[oracle@station ~]$ cd /u01/app/oracle/oradata/ORCL/onlinelog/
[oracle@station onlinelog]$ rm -rf *

[oracle@station onlinelog]$ cd /u01/app/oracle/flash_recovery_area/ORCL/onlinelog/
[oracle@station onlinelog]$ ls
o1_mf_1_7wntkonc_.log  o1_mf_2_7wntkqob_.log  o1_mf_3_7wntksjg_.log
[oracle@station onlinelog]$ rm -rf *

-----------------------------------------模擬日誌文件全部丟失------------------------------------

SQL> startup
ORACLE instance started.

Total System Global Area  281018368 bytes
Fixed Size                  2020192 bytes
Variable Size             134220960 bytes
Database Buffers          142606336 bytes
Redo Buffers                2170880 bytes
Database mounted.
ORA-00313: open failed for members of log group 1 of thread 1
ORA-00312: online log 1 thread 1:
'/u01/app/oracle/oradata/ORCL/onlinelog/o1_mf_1_7wntknox_.log'
ORA-00312: online log 1 thread 1:
'/u01/app/oracle/flash_recovery_area/ORCL/onlinelog/o1_mf_1_7wntkonc_.log'
-----------------------------------------查看日誌文件存在------------------------------------
SQL> ! ls /u01/app/oracle/oradata/ORCL/onlinelog/o1_mf_1_7wntknox_.log                           
ls: /u01/app/oracle/oradata/ORCL/onlinelog/o1_mf_1_7wntknox_.log: No such file or directory

SQL> ! ls /u01/app/oracle/flash_recovery_area/ORCL/onlinelog/o1_mf_1_7wntkonc_.log
ls: /u01/app/oracle/flash_recovery_area/ORCL/onlinelog/o1_mf_1_7wntkonc_.log: No such file or directory

-----------------------------------------查看日誌文件存在------------------------------------

-----------------------------------------查看日誌文件狀態------------------------------------
SQL> select group#,members,status from v$log;

    GROUP#    MEMBERS STATUS
---------- ---------- ----------------
         1          2 CURRENT
         3          2 INACTIVE
         2          2 INACTIVE
-----------------------------------------查看日誌文件狀態------------------------------------

SQL> recover database until cancel;    ---進行這個操作完成，等於重新刷新日誌（賬本），屬於不完全恢復，但是卻達到了完全恢復的效果，而且數據並沒有丟！
Media recovery complete.
SQL> alter database open;
alter database open
*
ERROR at line 1:
ORA-01589: must use RESETLOGS or NORESETLOGS option for database open

SQL> alter database open resetlogs;

Database altered.

SQL> ! ls -l /u01/app/oracle/oradata/ORCL/onlinelog
total 153780
-rw-r----- 1 oracle oinstall 52429312 Jun  8 13:15 o1_mf_1_7x4drff8_.log
-rw-r----- 1 oracle oinstall 52429312 Jun  8 13:15 o1_mf_2_7x4drlf5_.log
-rw-r----- 1 oracle oinstall 52429312 Jun  8 13:15 o1_mf_3_7x4drro7_.log

SQL> select * from hr.strom;

         A
----------
         1
         2
         3
-----------------控制文件和數據文件完好，日誌文件全部丟失，正常關機，不需備份，數據不丟-------------------