11g Release1 中引入了新的RMAN duplicate命令，即duplicate from active database命令。利用该命令可以更加便捷地创建Data Guard环境，你甚至不需要将Primary Database shutdown(整个过程中主库都可以处于打开状态下)，也不需要在配置前做一些额外的备份操作，仅需要配置起auxiliary辅助实例，同时创建密码文件，并在监听(LISTENER)中加入静态注册信息后就可以开始工作了！ 以下示例中我们会在Primary Database所在的同一台服务器上部署一套物理备库(Physical Standby)，实际上这样比在不同的2台服务器上配置Data Guard要复杂些，原因是那样的话我们无需做File Name的转换，具体的环境：
Database Role DB_UNIQUE_NAME
Primary Database PROD
Standby Database SBDB
  
/* 需要注意的是DG环境中force logging,不要用了新特性就将这个基本的要求忘记了 ！ */

SQL> select * from v$version;

BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.2.0 - 64bit Production
PL/SQL Release 11.2.0.2.0 - Production
CORE	11.2.0.2.0	Production
TNS for Linux: Version 11.2.0.2.0 - Production
NLSRTL Version 11.2.0.2.0 - Production

/* 显然PROD主库应当处于归档模式并且是FORCE LOGGING状态下 */

SQL> alter database force logging;
Database altered.

同时在Primary Database上创建必要的standby logfile:

SQL> alter database add standby logfile group 7 size 50M;
Database altered.

SQL> alter database add standby logfile group 8 size 50M;
Database altered.
 ..............

/* standby实例只需要db_name参数就可以启动到nomount模式了，
   并为standby数据库创建密码文件 */

[maclean@rh6 ~]$ echo "db_name=PROD" >$ORACLE_HOME/dbs/initSBDB.ora

[maclean@rh6 ~]$ orapwd file=$ORACLE_HOME/dbs/orapwSBDB password=XXXX entries=10

[maclean@rh6 ~]$ cd $ORACLE_HOME/network/admin

我们需要保证PROD和SBDB实例在监听器Listener中被静态注册，同时也包括DGMGRL需要用到的*_DGMGRL服务名

[maclean@rh6 admin]$ cat listener.ora
# listener23920.ora Network Configuration File: /tmp/listener23920.ora
# Generated by Oracle configuration tools.

DGLSN =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rh6.oracle.com)(PORT = 1588))
  )

SID_LIST_DGLSN =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = PROD)
      (ORACLE_HOME = /s01/product/11.2.0/dbhome_2)
      (SID_NAME = PROD)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = SBDB)
      (ORACLE_HOME = /s01/product/11.2.0/dbhome_2)
      (SID_NAME = SBDB)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = PROD_DGMGRL)
      (ORACLE_HOME = /s01/product/11.2.0/dbhome_2)
      (SID_NAME = PROD)
    )
    (SID_DESC =
      (GLOBAL_DBNAME = SBDB_DGMGRL)
      (ORACLE_HOME = /s01/product/11.2.0/dbhome_2)
      (SID_NAME = SBDB)
    )
  )

/* 并在tnsnames.ora文件中加入必要的服务别名 */

[maclean@rh6 admin]$ cat tnsnames.ora
# tnsnames.ora Network Configuration File: /s01/product/11.2.0/dbhome_2/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.

PROD =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rh6.oracle.com)(PORT = 1588))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = PROD)
    )
  )

SBDB =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = rh6.oracle.com)(PORT = 1588))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = SBDB)
    )
  )

DGLSN =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = rh6.oracle.com)(PORT = 1588))
  )

接着我们来启动辅助实例

[maclean@rh6 ~]$ export ORACLE_SID=SBDB
[maclean@rh6 ~]$ sqlplus  / as sysdba
SQL> startup  nomount;
ORACLE instance started.

/* 使用远程登录测试是否可以以SYSDBA登录SBDB实例 */

[maclean@rh6 ~]$ sqlplus  sys/XXXXXX@SBDB as sysdba

下面我们需要准备一份duplicate standby database的脚本，
因为我们是在同一台主机上配置Data Guard所以这里要用到db_file_name_convert和log_file_name_convert，
如果你的环境中不需要这么做那么你可以指定NOFILENAMECHECK；

以下为示例的脚本，可以看到它并不复杂只是指定了必要的初始化参数，十分易于记忆。

[maclean@rh6 ~]$ cat duplicate_act_standby.rcv

duplicate target database
for standby
from active database
DORECOVER
spfile
set db_unique_name='SBDB'
set log_archive_dest_1='location=/standby/arch02'
set log_archive_dest_2='service=PROD async lgwr register valid_for=(online_logfile,primary_role) db_unique_name=PROD'
set standby_file_management='AUTO'
set fal_server='PROD'
set fal_client='SBDB'
set control_files='/standby/oradata/SBDB/controlfile/control1.ctl','/standby/oradata/SBDB/controlfile/control2.ctl'
set db_file_name_convert='PROD','SBDB'
set log_file_name_convert='PROD','SBDB'
set memory_target='0'
set sga_target='400M';

具体执行以上脚本，我们需要同时登录target database PROD和auxiliary instance辅助实例SBDB:

[maclean@rh6 ~]$ echo $ORACLE_SID
PROD

[maclean@rh6 ~]$ rman target / auxiliary sys/oracle@SBDB cmdfile=duplicate_act_standby.rcv log=das.log

connected to target database: PROD (DBID=158660885)
connected to auxiliary database: PROD (not mounted)

RMAN> duplicate target database
2> for standby
3> from active database
4> DORECOVER
5> spfile
6> set db_unique_name='SBDB'
7> set log_archive_dest_1='location=/standby/arch02'
8> set log_archive_dest_2='service=PROD async lgwr register valid_for=(online_logfile,primary_role) db_unique_name=PROD'
9> set standby_file_management='AUTO'
10> set fal_server='PROD'
11> set fal_client='SBDB'
12> set control_files='/standby/oradata/SBDB/controlfile/control1.ctl','/standby/oradata/SBDB/controlfile/control2.ctl'
13> set db_file_name_convert='PROD','SBDB'
14> set log_file_name_convert='PROD','SBDB'
15> set memory_target='0'
16> set sga_target='400M';
17>
Starting Duplicate Db at 26-MAR-11
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=96 device type=DISK

contents of Memory Script:
{
   backup as copy reuse
   targetfile  '/s01/product/11.2.0/dbhome_2/dbs/orapwPROD' auxiliary format
 '/s01/product/11.2.0/dbhome_2/dbs/orapwSBDB'   targetfile
 '/s01/product/11.2.0/dbhome_2/dbs/spfilePROD.ora' auxiliary format
 '/s01/product/11.2.0/dbhome_2/dbs/spfileSBDB.ora'   ;
   sql clone "alter system set spfile= ''/s01/product/11.2.0/dbhome_2/dbs/spfileSBDB.ora''";
}
executing Memory Script

Starting backup at 26-MAR-11
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=17 device type=DISK
Finished backup at 26-MAR-11

sql statement: alter system set spfile= ''/s01/product/11.2.0/dbhome_2/dbs/spfileSBDB.ora''

contents of Memory Script:
{
   sql clone "alter system set  db_unique_name =
 ''SBDB'' comment=
 '''' scope=spfile";
   sql clone "alter system set  log_archive_dest_1 =
 ''location=/standby/arch02'' comment=
 '''' scope=spfile";
   sql clone "alter system set  log_archive_dest_2 =
 ''service=PROD async lgwr register valid_for=(online_logfile,primary_role) db_unique_name=PROD'' comment=
 '''' scope=spfile";
   sql clone "alter system set  standby_file_management =
 ''AUTO'' comment=
 '''' scope=spfile";
   sql clone "alter system set  fal_server =
 ''PROD'' comment=
 '''' scope=spfile";
   sql clone "alter system set  fal_client =
 ''SBDB'' comment=
 '''' scope=spfile";
   sql clone "alter system set  control_files =
 ''/standby/oradata/SBDB/controlfile/control1.ctl'', ''/standby/oradata/SBDB/controlfile/control2.ctl'' comment=
 '''' scope=spfile";
   sql clone "alter system set  db_file_name_convert =
 ''PROD'', ''SBDB'' comment=
 '''' scope=spfile";
   sql clone "alter system set  log_file_name_convert =
 ''PROD'', ''SBDB'' comment=
 '''' scope=spfile";
   sql clone "alter system set  memory_target =
 0 comment=
 '''' scope=spfile";
   sql clone "alter system set  sga_target =
 400M comment=
 '''' scope=spfile";
   shutdown clone immediate;
   startup clone nomount;
}
executing Memory Script

sql statement: alter system set  db_unique_name =  ''SBDB'' comment= '''' scope=spfile

sql statement: alter system set  log_archive_dest_1 =  ''location=/standby/arch02'' comment= '''' scope=spfile

sql statement: alter system set  log_archive_dest_2 =
''service=PROD async lgwr register valid_for=(online_logfile,primary_role) db_unique_name=PROD''
comment= '''' scope=spfile

sql statement: alter system set  standby_file_management =  ''AUTO'' comment= '''' scope=spfile

sql statement: alter system set  fal_server =  ''PROD'' comment= '''' scope=spfile

sql statement: alter system set  fal_client =  ''SBDB'' comment= '''' scope=spfile

sql statement: alter system set  control_files =  ''/standby/oradata/SBDB/controlfile/control1.ctl'',
''/standby/oradata/SBDB/controlfile/control2.ctl''
comment= '''' scope=spfile

sql statement: alter system set  db_file_name_convert =  ''PROD'', ''SBDB'' comment= '''' scope=spfile

sql statement: alter system set  log_file_name_convert =  ''PROD'', ''SBDB'' comment= '''' scope=spfile

sql statement: alter system set  memory_target =  0 comment= '''' scope=spfile

sql statement: alter system set  sga_target =  400M comment= '''' scope=spfile

Oracle instance shut down

connected to auxiliary database (not started)
Oracle instance started

Total System Global Area     417546240 bytes

Fixed Size                     2227072 bytes
Variable Size                134218880 bytes
Database Buffers             272629760 bytes
Redo Buffers                   8470528 bytes

contents of Memory Script:
{
   backup as copy current controlfile for standby auxiliary format  '/standby/oradata/SBDB/controlfile/control1.ctl';
   restore clone controlfile to  '/standby/oradata/SBDB/controlfile/control2.ctl' from
 '/standby/oradata/SBDB/controlfile/control1.ctl';
}
executing Memory Script

Starting backup at 26-MAR-11
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
copying standby control file
output file name=/s01/product/11.2.0/dbhome_2/dbs/snapcf_PROD.f tag=TAG20110326T195144 RECID=2 STAMP=746826704
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 26-MAR-11

Starting restore at 26-MAR-11
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=134 device type=DISK

channel ORA_AUX_DISK_1: copied control file copy
Finished restore at 26-MAR-11

contents of Memory Script:
{
   sql clone 'alter database mount standby database';
}
executing Memory Script

sql statement: alter database mount standby database

contents of Memory Script:
{
   set newname for tempfile  1 to
 "/standby/oradata/SBDB/datafile/o1_mf_temp_6rvjsmr4_.tmp";
   switch clone tempfile all;
   set newname for datafile  1 to
 "/standby/oradata/SBDB/datafile/o1_mf_system_6rvjrtxh_.dbf";
   set newname for datafile  2 to
 "/standby/oradata/SBDB/datafile/o1_mf_sysaux_6rvjs6vh_.dbf";
   set newname for datafile  3 to
 "/standby/oradata/SBDB/datafile/o1_mf_undotbs1_6rvjsjjg_.dbf";
   set newname for datafile  4 to
 "/standby/oradata/SBDB/datafile/o1_mf_users_6rvjsy5q_.dbf";
   backup as copy reuse
   datafile  1 auxiliary format
 "/standby/oradata/SBDB/datafile/o1_mf_system_6rvjrtxh_.dbf"   datafile
 2 auxiliary format
 "/standby/oradata/SBDB/datafile/o1_mf_sysaux_6rvjs6vh_.dbf"   datafile
 3 auxiliary format
 "/standby/oradata/SBDB/datafile/o1_mf_undotbs1_6rvjsjjg_.dbf"   datafile
 4 auxiliary format
 "/standby/oradata/SBDB/datafile/o1_mf_users_6rvjsy5q_.dbf"   ;
   sql 'alter system archive log current';
}
executing Memory Script

executing command: SET NEWNAME

renamed tempfile 1 to /standby/oradata/SBDB/datafile/o1_mf_temp_6rvjsmr4_.tmp in control file

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

executing command: SET NEWNAME

Starting backup at 26-MAR-11
using channel ORA_DISK_1
channel ORA_DISK_1: starting datafile copy
input datafile file number=00001 name=/standby/oradata/PROD/datafile/o1_mf_system_6rvjrtxh_.dbf
output file name=/standby/oradata/SBDB/datafile/o1_mf_system_6rvjrtxh_.dbf tag=TAG20110326T195152
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15
channel ORA_DISK_1: starting datafile copy
input datafile file number=00002 name=/standby/oradata/PROD/datafile/o1_mf_sysaux_6rvjs6vh_.dbf
output file name=/standby/oradata/SBDB/datafile/o1_mf_sysaux_6rvjs6vh_.dbf tag=TAG20110326T195152
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:15
channel ORA_DISK_1: starting datafile copy
input datafile file number=00003 name=/standby/oradata/PROD/datafile/o1_mf_undotbs1_6rvjsjjg_.dbf
output file name=/standby/oradata/SBDB/datafile/o1_mf_undotbs1_6rvjsjjg_.dbf tag=TAG20110326T195152
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:07
channel ORA_DISK_1: starting datafile copy
input datafile file number=00004 name=/standby/oradata/PROD/datafile/o1_mf_users_6rvjsy5q_.dbf
output file name=/standby/oradata/SBDB/datafile/o1_mf_users_6rvjsy5q_.dbf tag=TAG20110326T195152
channel ORA_DISK_1: datafile copy complete, elapsed time: 00:00:01
Finished backup at 26-MAR-11

sql statement: alter system archive log current

contents of Memory Script:
{
   backup as copy reuse
   archivelog like  "/standby/arch01/1_17_746822549.dbf" auxiliary format
 "/standby/arch02/1_17_746822549.dbf"   ;
   catalog clone archivelog  "/standby/arch02/1_17_746822549.dbf";
   switch clone datafile all;
}
executing Memory Script

Starting backup at 26-MAR-11
using channel ORA_DISK_1
channel ORA_DISK_1: starting archived log copy
input archived log thread=1 sequence=17 RECID=3 STAMP=746826751
output file name=/standby/arch02/1_17_746822549.dbf RECID=0 STAMP=0
channel ORA_DISK_1: archived log copy complete, elapsed time: 00:00:01
Finished backup at 26-MAR-11

cataloged archived log
archived log file name=/standby/arch02/1_17_746822549.dbf RECID=1 STAMP=746826752

datafile 1 switched to datafile copy
input datafile copy RECID=2 STAMP=746826752 file name=/standby/oradata/SBDB/datafile/o1_mf_system_6rvjrtxh_.dbf
datafile 2 switched to datafile copy
input datafile copy RECID=3 STAMP=746826752 file name=/standby/oradata/SBDB/datafile/o1_mf_sysaux_6rvjs6vh_.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=4 STAMP=746826752 file name=/standby/oradata/SBDB/datafile/o1_mf_undotbs1_6rvjsjjg_.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=5 STAMP=746826752 file name=/standby/oradata/SBDB/datafile/o1_mf_users_6rvjsy5q_.dbf

contents of Memory Script:
{
   set until scn  242517;
   recover
   standby
   clone database
    delete archivelog
   ;
}
executing Memory Script

executing command: SET until clause

Starting recover at 26-MAR-11
using channel ORA_AUX_DISK_1

starting media recovery

archived log for thread 1 with sequence 17 is already on disk as file /standby/arch02/1_17_746822549.dbf
archived log file name=/standby/arch02/1_17_746822549.dbf thread=1 sequence=17
media recovery complete, elapsed time: 00:00:00
Finished recover at 26-MAR-11
Finished Duplicate Db at 26-MAR-11

Recovery Manager complete.

[maclean@rh6 ~]$ export ORACLE_SID=PROD
[maclean@rh6 ~]$ sqlplus  / as sysdba

/* 在主库PROD上设置到物理备库SBDB的归档目的地 */

SQL> alter system set log_archive_dest_2='service=sbdb lgwr async