操作步骤：（开启归档）
在任一个节点操作：
[oracle@rac02 ~]$ srvctl stop database -d mecbs [oracle@rac02 ~]$ sqlplus / as sysdba SQL*Plus: Release 11.2.0.4.0 Production on Mon Sep 14 23:24:19 2015 Copyright (c) 1982, 2013, Oracle. All rights reserved. Connected to an idle instance. SQL> startup mount; ORACLE instance started. Total System Global Area 776646656 bytes Fixed Size 2257272 bytes Variable Size 570429064 bytes Database Buffers 197132288 bytes Redo Buffers 6828032 bytes Database mounted. SQL> alter system set log_archive_dest_1='LOCATION=+ARCH' scope=spfile sid='*'; System altered. SQL> alter system set cluster_database=false scope=spfile; System altered. SQL> alter database archivelog; Database altered. SQL> alter database open; Database altered. SQL> alter system set cluster_database=true scope=spfile; System altered. SQL> shutdow immediate; Database closed. Database dismounted. ORACLE instance shut down. SQL> startup ORACLE instance started. SQL> startup ORACLE instance started. Total System Global Area 776646656 bytes Fixed Size 2257272 bytes Variable Size 570429064 bytes Database Buffers 197132288 bytes Redo Buffers 6828032 bytes Database mounted. Database opened. SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination +ARCH Oldest online log sequence 4 Next log sequence to archive 5 Current log sequence 5 开启其他节点。。。开启数据库闪回：
[oracle@rac01 ~]$ srvctl stop database -d mecbs SQL> startup mount; ORACLE instance started. Total System Global Area 776646656 bytes Fixed Size 2257272 bytes Variable Size 541068936 bytes Database Buffers 230686720 bytes Redo Buffers 2633728 bytes Database mounted. SQL> alter system set db_recovery_file_dest_size=10G scope=spfile sid='*'; System altered. SQL> alter system set db_recovery_file_dest='+FRA' scope=spfile sid='*'; System altered. SQL> shutdown immediate; ORA-01109: database not open Database dismounted. ORACLE instance shut down SQL> startup mount; ORACLE instance started. Total System Global Area 776646656 bytes Fixed Size 2257272 bytes Variable Size 541068936 bytes Database Buffers 230686720 bytes Redo Buffers 2633728 bytes Database mounted. SQL> alter database flashback on; SQL> alter database open; Database altered. SQL> show parameter db_recovery; NAME TYPE VALUE ------------------------------------ ----------- ------------------------------ db_recovery_file_dest string +FRA db_recovery_file_dest_size big integer 10G SQL> archive log list; Database log mode Archive Mode Automatic archival Enabled Archive destination +ARCH Oldest online log sequence 5 Next log sequence to archive 6 Current log sequence 6 ASMCMD [+ARCH/MECBS/ARCHIVELOG] > du Used_MB Mirror_used_MB 9 9 ASMCMD [+fra/MECBS/FLASHBACK] > du Used_MB Mirror_used_MB 204 204=======END=========
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