current online redo logfile 丢失的处理方法

做了rm -rf操作后的恢复演练，而且是在没有任何备份的情况下。今天在做破坏性操作前，做了个rman全备，然后在线删除全部数据库文

前面（见）做了rm -rf操作后的恢复演练，而且是在没有任何备份的情况下。今天在做破坏性操作前，做了个rman全备，然后在线删除全部数据库文件，包括控制文件，数据文件，在线日志文件，归档文件等。来看看有什么方法可以让数据库恢复运行，由于是current redo logfile丢失，那么本次测试是会丢失数据的，所以可以作为不完全恢复的一个案例。

--登入数据库进行dml操作
[Oracle@ora10g ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 26 13:40:37 2014

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

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> select * from aaron8219.test1;

INT
----------
1
2

SQL> insert into aaron8219.test1 values(3);

1 row created.

SQL> select group#,status,sequence# from v$log;

GROUP# STATUS SEQUENCE#
---------- ---------------- ----------
1 INACTIVE 1
2 CURRENT 2
3 INACTIVE 0

--不提交，另开一个session进行rm -rf操作
[root@ora10g ~]# cd /u01/app/oracle/oradata
[root@ora10g oradata]# ll
total 4
drwxr-x--- 2 oracle oinstall 4096 Aug 25 16:09 ora10g
[root@ora10g oradata]# rm -rf ora10g/
[root@ora10g oradata]# ll
total 0

--原session直接abort关闭，模拟current online redo logfile丢失
SQL> shutdown abort

--用之前刚生成的rman全备来还原数据库各类文件
[oracle@ora10g ~]$ rman target /

Recovery Manager: Release 10.2.0.1.0 - Production on Tue Aug 26 13:44:58 2014

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

connected to target database: ora10g (not mounted)

RMAN> restore controlfile from '/rmanbak/full_ORA10G_4175411955_20140826_02pgtq5h_1_1.bak';

Starting restore at 26-AUG-14
using channel ORA_DISK_1

channel ORA_DISK_1: restoring control file
channel ORA_DISK_1: restore complete, elapsed time: 00:00:04
output filename=/u01/app/oracle/oradata/ora10g/control01.ctl
output filename=/u01/app/oracle/oradata/ora10g/control02.ctl
output filename=/u01/app/oracle/oradata/ora10g/control03.ctl
Finished restore at 26-AUG-14

RMAN> alter database mount;

database mounted
released channel: ORA_DISK_1

RMAN> restore database;

Starting restore at 26-AUG-14
Starting implicit crosscheck backup at 26-AUG-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=156 devtype=DISK
Crosschecked 1 objects
Finished implicit crosscheck backup at 26-AUG-14

Starting implicit crosscheck copy at 26-AUG-14
using channel ORA_DISK_1
Finished implicit crosscheck copy at 26-AUG-14

searching for all files in the recovery area
cataloging files...
cataloging done

List of Cataloged Files
=======================
File Name: /u01/app/oracle/flash_recovery_area/ORA10G/autobackup/2014_08_26/o1_mf_s_856615092_9zr3snsq_.bkp

using channel ORA_DISK_1

channel ORA_DISK_1: starting datafile backupset restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
restoring datafile 00001 to /u01/app/oracle/oradata/ora10g/system01.dbf
restoring datafile 00002 to /u01/app/oracle/oradata/ora10g/undotbs01.dbf
restoring datafile 00003 to /u01/app/oracle/oradata/ora10g/sysaux01.dbf
restoring datafile 00004 to /u01/app/oracle/oradata/ora10g/users01.dbf
restoring datafile 00005 to /u01/app/oracle/oradata/ora10g/example01.dbf
channel ORA_DISK_1: reading from backup piece /rmanbak/full_ORA10G_4175411955_20140826_01pgtq36_1_1.bak
channel ORA_DISK_1: restored backup piece 1
piece handle=/rmanbak/full_ORA10G_4175411955_20140826_01pgtq36_1_1.bak tag=TAG20140826T123653
channel ORA_DISK_1: restore complete, elapsed time: 00:01:46
Finished restore at 26-AUG-14

RMAN> exit

Recovery Manager complete.

由于rman并不备份在线日志文件，刚才的rman只是做了个全库备份和控制文件的备份，可以看到redo01.log，redo02.log，redo03.log这3个文件并不存在

[oracle@ora10g ~]$ sqlplus / as sysdba

SQL*Plus: Release 10.2.0.1.0 - Production on Tue Aug 26 14:52:35 2014

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

Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.1.0 - Production
With the Partitioning, OLAP and Data Mining options

SQL> select open_mode from v$database;

OPEN_MODE
----------
MOUNTED

SQL> col member for a60
SQL> select group#,member from v$logfile;