1.查看数据库是否开启归档(查看两个节点rac1和rac2是否开归档日志)

SQL> archiveloglist

SP2-0734: unknown command beginning "archivelog..." - rest of line ignored.

SQL> archive log list

Database log mode              No Archive Mode

Automatic archival             Disabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     7

Current log sequence           8

SQL> 

2.在节点1(rac1)中设置只修改节点1的参数,不影响节点2.

SQL> alter system set cluster_database=false scope=spfile sid='racdb1';

System altered.

SQL> 

3.在节点1(rac1)用srvctl命令关闭数据库

[oracle@rac1 ~]$ srvctl stop database -d racdb

4.挂载数据库,日志修改为归档

SQL> startup mount

SQL> alter database archivelog;

SQL> alter system set cluster_database=true scope=spfile sid='racdb1';

SQL> shutdown immediate

5.启动数据库

[oracle@rac1 ~]$ srvctl start database -d racdb

6.检查修改后的归档信息

SQL> archive log list

Database log mode              Archive Mode

Automatic archival             Enabled

Archive destination            USE_DB_RECOVERY_FILE_DEST

Oldest online log sequence     9

Next log sequence to archive   10

Current log sequence           10

SQL>

7.查看数据库是否启用闪回功能

节点1(rac1):

SQL> select flashback_on from v$database;   --必须先开启归档

FLASHBACK_ON

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

NO

SQL>

8.设置闪回的路径和大小

SQL> alter system set cluster_database=false scope=spfile sid='racdb1';

SQL> alter system set db_recovery_file_dest='+FALSE' scope=spfile;

SQL> alter system set db_recovery_file_dest_size=5G scope=spfile;

9.关闭数据库

[oracle@rac1 ~]$ srvctl stop database -d racdb

10.启用闪回

SQL> startup mount

SQL> alter database flashback on;

SQL> alter system set cluster_database=true scope=spfile sid='racdb1';

SQL> shutdown immediate

11.启动数据库

[oracle@rac1 ~]$ srvctl start database -d racdb

12.查看闪回功能

SQL> select flashback_on from v$database;

FLASHBACK_ON

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

YES

SQL>

13.也可启用表空间闪回

SQL> alter tablespace abc flashback on;    --开启表空间闪回

SQL> alter tablespace abc flashback off;    --关闭表空间闪回