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

sql>showparameterrecovery
NAMETYPEVALUE
-----------------------------------------------------------------------------
db_recovery_file_deststring
db_recovery_file_dest_sizebiginteger0
recovery_parallelisminteger0

2、查询是否开户归档日志

sql>archiveloglist
DatabaselogmodeArchiveMode
AutomaticarchivalEnabled
Archivedestination/oracle/app/oracle/product/11.2.0/db_1/dbs/arch
Oldestonlinelogsequence35
Nextlogsequencetoarchive36
Currentlogsequence36

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

sql>showparametercluster
NAMETYPEVALUE
-----------------------------------------------------------------------------
cluster_databasebooleanTRUE
cluster_database_instancesinteger2
cluster_interconnectsstring

4、关闭另外一个节点数据库

sql>shutdownimmediate
Databaseclosed.
Databasedismounted.
ORACLEinstanceshutdown.

5、在当前正常节点修改集群为单节点模式

sql>altersystemsetcluster_database=falsescope=spfile;
Systemaltered.

6、配置闪回大小

sql>altersystemsetdb_recovery_file_dest_size=2Gscope=both;
Systemaltered.

7、配置归档日志路径，配置在DG中

sql>altersystemsetdb_recovery_file_dest='+DGRECOVERY'scope=both;
Systemaltered.

8、关闭当前节点数据库

sql>shutdownimmediate
Databaseclosed.
Databasedismounted.
ORACLEinstanceshutdown.

9.把当前节点数据库启动到mount状态中修改归档

sql>startupmount
ORACLEinstancestarted.
TotalSystemGlobalArea784998400bytes
FixedSize2257352bytes
VariableSize331353656bytes
DatabaseBuffers448790528bytes
RedoBuffers2596864bytes
Databasemounted.

10.查询当前数据库是处于什么状态

sql>selectstatusfromv$instance
2;
STATUS
------------
MOUNTED

11.修改数据库归档

sql>alterdatabasearchivelog;
Databasealtered.

12.恢复数据库双节点实例

sql>altersystemsetcluster_database=truescope=spfile;
Systemaltered.

13.打开数据库

sql>alterdatabaSEOpen;
Databasealtered.

14.查询当前数据库状态

sql>selectstatusfromv$instance;
STATUS
------------
OPEN

15、查询数据库集群状态

sql>showparametercluster
NAMETYPEVALUE
-----------------------------------------------------------------------------
cluster_databasebooleanTRUE
cluster_database_instancesinteger2
cluster_interconnectsstring

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

sql>altersystemswitchlogfile;
Systemaltered.

18、查询归档中数据

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

通过以上则可以判断数据库可以正常归档