oracle rac 归档设置需要不像单实例设置简单，开启过程需要注意一些细节
归档开启思路：
1：查看数据库是否开启归档
2：创建共享目录（归档一定要放在共享存储上）
3：将rac设置成单实例模式
4：分别关闭各个节点实例
5：将其中一个节点启动到mount状态，开启归档，设置归档路径，格式，并打开数据库还原rac模式
6： 打开所有节点数据库
7：查看数据库归档参数设置是否生效
8：切换归档，查看归档是否正常工作
1、查询归档当前信息
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SQL> show parameter recovery
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
db_recovery_file_dest string
db_recovery_file_dest_size big integer 0
recovery_parallelism integer 0
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2、查询是否开户归档日志
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SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination /oracle/app/oracle/product/11.2.0/db_1/dbs/arch
Oldest online log sequence 35
Next log sequence to archive 36
Current log sequence 36
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说明：从当前查询是已开始归档模式了，但是规定路径不对要重新修改
3、查询集群参数
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SQL> show parameter cluster
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cluster_database boolean TRUE
cluster_database_instances integer 2
cluster_interconnects string
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4、关闭另外一个节点数据库
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SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
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5、在当前正常节点修改集群为单节点模式
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SQL> alter system set cluster_database=false scope=spfile;
System altered.
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6、配置闪回大小
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SQL> alter system set db_recovery_file_dest_size=2G scope=both;
System altered.
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7、配置归档日志路径，配置在DG中
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SQL> alter system set db_recovery_file_dest='+DGRECOVERY'scope=both;
System altered.
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8、关闭当前节点数据库
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SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
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9.把当前节点数据库启动到mount状态中修改归档
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SQL> startup mount
ORACLE instance started.
Total System Global Area 784998400 bytes
Fixed Size 2257352 bytes
Variable Size 331353656 bytes
Database Buffers 448790528 bytes
Redo Buffers 2596864 bytes
Database mounted.
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10.查询当前数据库是处于什么状态
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SQL> select status from v$instance
2 ;
STATUS
------------
MOUNTED
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11.修改数据库归档
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SQL> alter database archivelog;
Database altered.
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12.恢复数据库双节点实例
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SQL> alter system set cluster_database=true scope=spfile;
System altered.
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13.打开数据库
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SQL> alter database open;
Database altered.
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14.查询当前数据库状态
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SQL> select status from v$instance;
STATUS
------------
OPEN
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15、查询数据库集群状态
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SQL> show parameter cluster
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
cluster_database boolean TRUE
cluster_database_instances integer 2
cluster_interconnects string
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16、再启动另外一个节点
startup
17、切换归档日志，判断是否切换成功
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SQL> alter system switch logfile;
System altered.
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18、查询归档中数据
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ASMCMD> pwd
+DGRECOVERY/RAC/ARCHIVELOG/2017_06_13
ASMCMD> ls
thread_1_seq_37.256.946542069
thread_1_seq_38.257.946542129
thread_1_seq_39.258.946542133
thread_1_seq_40.260.946542135
thread_1_seq_41.261.946543367
thread_1_seq_42.262.946543369
thread_1_seq_43.264.946543373
thread_1_seq_44.265.946543375
thread_1_seq_45.266.946543377
thread_1_seq_46.267.946543377
thread_1_seq_47.269.946544929
thread_2_seq_4.259.946542029
thread_2_seq_5.263.946543265
thread_2_seq_6.268.946543277
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通过以上则可以判断数据库可以正常归档
本文转自xiaocao1314051CTO博客，原文链接： http://blog.51cto.com/xiaocao13140/1936847，如需转载请自行联系原作者
