下面我們做一個實驗，演示如何對oracle進行基於時間點的不完全恢復（在實驗之前請確保資料庫具有有效備份）：
獲取此時的時間並記錄下來：
SQL> select to_char(sysdate,'yyyy-mm-dd hh24:mi:ss') from dual;

TO_CHAR(SYSDATE,'YY
-------------------
2014-08-23 00:47:49

把hh使用者下的h2刪除：
SQL> drop table h2;

Table dropped.

使用rman將資料庫恢復到刪除h2之前：
關閉資料庫，啟動rman，重啟資料庫到mount：
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.

[oracle@localhost ~]$ rman target / nocatalog

Recovery Manager: Release 11.2.0.1.0 - Production on Sat Aug 23 00:55:12 2014

Copyright (c) 1982, 2009, Oracle and/or its affiliates. All rights reserved.

connected to target database (not started)

RMAN> startup mount;

Oracle instance started
database mounted

Total System Global Area 849530880 bytes

Fixed Size 1339824 bytes
Variable Size 553651792 bytes
Database Buffers 289406976 bytes
Redo Buffers 5132288 bytes

使用rman將資料庫恢復到2014-08-23 00:47:49

RMAN> sql 'alter session set nls_date_format="yyyy-mm-dd hh24:mi:ss"';

sql statement: alter session set nls_date_format="yyyy-mm-dd hh24:mi:ss"

RMAN> restore database until time '2014-08-23 00:47:49';

Starting restore at 23-AUG-14
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=18 device type=DISK

skipping datafile 6; already restored to file /u01/app/datafile/test01.dbf
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 00003 to /u01/app/oracle/oradata/orcl/undotbs01.dbf
channel ORA_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/orcl/example01.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/backup/fulldb_0qpgkgjo_1_1
channel ORA_DISK_1: piece handle=/u01/app/backup/fulldb_0qpgkgjo_1_1 tag=FULLDB
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:06
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 00002 to /u01/app/oracle/oradata/orcl/sysaux01.dbf
channel ORA_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/orcl/users01.dbf
channel ORA_DISK_1: restoring datafile 00007 to /u01/app/oracle/oradata/orcl/hh01.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/backup/fulldb_0ppgkgjo_1_1
channel ORA_DISK_1: piece handle=/u01/app/backup/fulldb_0ppgkgjo_1_1 tag=FULLDB
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:35
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 /u01/app/oracle/oradata/orcl/system01.dbf
channel ORA_DISK_1: reading from backup piece /u01/app/backup/fulldb_0opgkgjo_1_1
channel ORA_DISK_1: piece handle=/u01/app/backup/fulldb_0opgkgjo_1_1 tag=FULLDB
channel ORA_DISK_1: restored backup piece 1
channel ORA_DISK_1: restore complete, elapsed time: 00:00:45
Finished restore at 23-AUG-14

RMAN> recover database until time '2014-08-23 00:47:49';

Starting recover at 23-AUG-14
using channel ORA_DISK_1

starting media recovery

archived log for thread 1 with sequence 1 is already on disk as file /u01/app/archivelog/dest1/1_1_856304357.dbf
archived log for thread 1 with sequence 2 is already on disk as file /u01/app/archivelog/dest1/1_2_856304357.dbf
archived log for thread 1 with sequence 3 is already on disk as file /u01/app/archivelog/dest1/1_3_856304357.dbf
archived log for thread 1 with sequence 1 is already on disk as file /u01/app/archivelog/dest1/1_1_856310126.dbf
archived log file name=/u01/app/archivelog/dest1/1_1_856304357.dbf thread=1 sequence=1
archived log file name=/u01/app/archivelog/dest1/1_2_856304357.dbf thread=1 sequence=2
archived log file name=/u01/app/archivelog/dest1/1_3_856304357.dbf thread=1 sequence=3
media recovery complete, elapsed time: 00:00:16
Finished recover at 23-AUG-14

使用resetlogs開啟資料庫：
SQL> alter database open resetlogs;

Database altered.

SQL> select * from hh.h2;

ID
----------
1
2

oracle基於時間點的不完全恢復

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