OCM_Session3_3_Flashback Database

• 
  3. Flashback Database
•  3.1 Turn on Flashback Database
•   3.1.1 Configure a flash recovery area of 4GB
•   3.1.2 Put your flash recovery area in /home/oracle/flash (you may have to create this diretory)
•  3.2 Leave your databases open for review.

首先创建一个路径，然后配置闪回去大小和位置，mount状态下flashback为on，最后打开数据库。

[oracle@ocm1 ~]$ mkdir /home/oracle/flash

[oracle@ocm1 ~]$ sqlplus "/as sysdba"

SQL*Plus: Release 10.2.0.1.0 - Production on Fri Mar 21 14:13:55 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> show parameter db_recovery_file_dest

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

db_recovery_file_dest                string

db_recovery_file_dest_size           big integer 0

SQL> alter system set db_recovery_file_dest_size=4g scope=spfile;

System altered.

SQL> alter system set db_recovery_file_dest='/home/oracle/flash' scope=spfile;

System altered.

SQL> shutdown immediate

Database closed.

Database dismounted.

ORACLE instance shut down.

SQL> startup mount;

ORACLE instance started.

Total System Global Area  524288000 bytes

Fixed Size                  1220360 bytes

Variable Size             176161016 bytes

Database Buffers          343932928 bytes

Redo Buffers                2973696 bytes

Database mounted.

SQL> alter database flashback on;

Database altered.

SQL> alter database open;

Database altered.

SQL> select flashback_on from v$database;

FLASHBACK_ON

------------------

YES

SQL> 

SQL> show parameter recovery

NAME                                 TYPE        VALUE

------------------------------------ ----------- ------------------------------

db_recovery_file_dest                string      /home/oracle/flash

db_recovery_file_dest_size           big integer 4G

recovery_parallelism                 integer     0