1. 故障原因
使用ruby将ql用户下的表全部彻底删除，回收站没有，因此使用“闪回表”失效；
flashback database被关闭；
只有通过介质恢复。
2. 使用RMAN实现基于时间点的恢复
2.1 启动数据库到mount
SQL> startup nomount;
Total System Global Area 2254802944 bytes
Fixed Size 2215344 bytes
Variable Size 1375732304 bytes
Database Buffers 872415232 bytes
Redo Buffers 4440064 bytes
2.2 恢复控制文件到误删除之前的一个副本
RMAN> restore controlfile from '/opt/oracle/11g/flash_recovery_area/ORCL//2012_06_03/o1_mf_s_784987822_7worxgk6_.bkp';
2.3 mount数据库
SQL> alter database mount;
Database altered.
2.4 将数据库文件恢复到特定时间点
[oracle@localhost ~]$ export NLS_DATE_FORMAT='yyyy-mm-dd hh24:mi:ss'
[oracle@localhost ~]$ rman target /;
RMAN> run
2> {
3> set until time '2012-06-06 21:00:00';
4> restore database;
5> recover database
6> };
executing command: SET until clause
-- 开始介质恢复
Starting restore at 2012-06-07 09:32:23
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile backup set restore
channel ORA_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_DISK_1: restoring datafile 00001 to /opt/oracle/11g/oradata/o01.dbf
channel ORA_DISK_1: restoring datafile 00002 to /opt/oracle/11g/oradata/o01.dbf
channel ORA_DISK_1: restoring datafile 00003 to /opt/oracle/11g/oradata/os01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /opt/oracle/11g/oradata/o1.dbf
channel ORA_DISK_1: restoring datafile 00005 to /opt/oracle/11g/oradata/oe01.dbf
channel ORA_DISK_1: restoring datafile 00006 to /opt/oracle/11g/software/s.dbf
channel ORA_DISK_1: reading from backup piece /opt/oracle/11g/flash_recovRCL/backupset/2012_06_03/o1_mf_nnndf_TAG20120603T120856_7wortx30_.bkp
channel ORA_DISK_1: piece handle=/opt/oracle/11g/flash_recovery_area/ORCLTAG20120603T120856_7wortx30_.bkp tag=TAG20120603T120856
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:01:08
Finished restore at 2012-06-07 09:33:31
-- 开始日志恢复
Starting recover at 2012-06-07 09:33:31
using channel ORA_DISK_1
starting media recovery
archived log for thread 1 with sequence 294 is already on disk as file /oORCL/archivelog/2012_06_04/o1_mf_1_294_7wqlknmq_.arc
archived log for thread 1 with sequence 295 is already on disk as file /oORCL/archivelog/2012_06_04/o1_mf_1_295_7wrdpv34_.arc
archived log for thread 1 with sequence 296 is already on disk as file /oORCL/archivelog/2012_06_05/o1_mf_1_296_7wtd8745_.arc
archived log for thread 1 with sequence 297 is already on disk as file /oORCL/archivelog/2012_06_05/o1_mf_1_297_7ww7rbh6_.arc
archived log for thread 1 with sequence 298 is already on disk as file /oORCL/archivelog/2012_06_06/o1_mf_1_298_7wx5rl22_.arc
archived log for thread 1 with sequence 299 is already on disk as file /olog
archived log file name=/opt/oracle/11g/flash_recovery_area/ORCL/archivelo.arc thread=1 sequence=294
archived log file name=/opt/oracle/11g/flash_recovery_area/ORCL/archivelo.arc thread=1 sequence=295
archived log file name=/opt/oracle/11g/flash_recovery_area/ORCL/archivelo.arc thread=1 sequence=296
archived log file name=/opt/oracle/11g/flash_recovery_area/ORCL/archivelo.arc thread=1 sequence=297
archived log file name=/opt/oracle/11g/flash_recovery_area/ORCL/archivelo.arc thread=1 sequence=298
archived log file name=/opt/oracle/11g/oradata/orcl/redo02.log thread=1 s
media recovery complete, elapse