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

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

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