本次试验将部署到ASM上的双节点RAC复制到单实例的ASM上。该试验也是出自于一个项目的需求，在虚拟机上演练操作特此记录。之前已经做过多次RMAN复制数据库，这次试验的特点是从RAC复制到单实例。需要注意的以下内容：
1，spfile参数问题
RAC下的spfile参数中记录了很多和集群相关的信息，在复制时需要修改。比如
*.cluster_database=true
PROD2.instance_number=2
PROD1.instance_number=1
*.remote_listener='cluster-scan:1521'
PROD2.thread=2
PROD1.thread=1
PROD2.undo_tablespace='UNDOTBS2'
PROD1.undo_tablespace=‘UNDOTBS1’
和RAC相关的信息可以选择注释掉，或者删除。
2，undo表空间问题
双节点RAC的备份集中会产生2个undo表空间及其数据文件，而单实例数据库只需要一个undo表空间。使用RAC的备份集在单实例数据库上恢复后，可以手工删除多余的那个undo表空间及其数据文件，通常是undotbs2
3，redo问题
双节点RAC的控制文件的备份中记录的是两个实例的redo信息，恢复完成后在open resetlogs打开数据库后回创建出thread2的online redo log，也就是节点2的联机日志。同undotbs2的处理原则一样，删除之。
1，RAC 端rman全备数据库到/backup目录下。
[Oracle@node1 ~]$ rman target /
Recovery Manager: Release 11.2.0.4.0 - Production on Mon Sep 29 03:15:49 2014
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
connected to target database: PROD (DBID=271163854)
RMAN> run{
2> allocate channel c1 type disk;
3> allocate channel c2 type disk;
4> backup tag 'full' format '/backup/full_%U.bak'
5> database include current controlfile;
6> sql 'alter system archive log current';
7> backup tag 'arch' format '/backup/arch_%U.arc'
8> archivelog all;
9> release channel c1;
10> release channel c2;
11> }
RMAN> list backup;
List of Backup Sets
===================
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
43 Full 522.99M DISK 00:00:04 2014-09-29 03:05:29
BP Key: 43 Status: AVAILABLE Compressed: NO Tag: FULL
Piece Name: /backup/full_1bpjmdbl_1_1.bak
List of Datafiles in backup set 43
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- ------------------- ----
2 Full 1298717 2014-09-29 03:05:25 +DATA/prod/datafile/sysaux.257.859325451
4 Full 1298717 2014-09-29 03:05:25 +DATA/prod/datafile/users.259.859325451
5 Full 1298717 2014-09-29 03:05:25 +DATA/prod/datafile/example.264.859325525
6 Full 1298717 2014-09-29 03:05:25 +DATA/prod/datafile/undotbs2.265.859325695
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
44 Full 649.16M DISK 00:00:04 2014-09-29 03:05:29
BP Key: 44 Status: AVAILABLE Compressed: NO Tag: FULL
Piece Name: /backup/full_1cpjmdbl_1_1.bak
List of Datafiles in backup set 44
File LV Type Ckp SCN Ckp Time Name
---- -- ---- ---------- ------------------- ----
1 Full 1298719 2014-09-29 03:05:25 +DATA/prod/datafile/system.256.859325451
3 Full 1298719 2014-09-29 03:05:25 +DATA/prod/datafile/undotbs1.258.859325451
7 Full 1298719 2014-09-29 03:05:25 +DATA/prod/datafile/goldengate.269.859338811
BS Key Type LV Size Device Type Elapsed Time Completion Time
------- ---- -- ---------- ----------- ------------ -------------------
45 Full 80.00K DISK 00:00:00 2014-09-29 03:05:32
BP Key: 45 Status: AVAILABLE Compressed: NO Tag: FULL
Piece Name: /backup/full_1epjmdbs_1_1.bak << 参数文件所在备份片，后面恢复时候需要用到
SPFILE Included: Modification time: 2014-09-29 02:02:18
SPFILE db_unique_name: PROD