1 软件环境
- Oracle Linux 6.9
- Oracle 12.1.0.2
- 主库：sz.oracle.com，IP：192.168.1.102
- 备库：sh.oracle.com，IP：192.168.1.103
2 主数据库配置
2.1 检查并设置数据库
1）首先，主数据库必须处于强制日志（Force Logging）模式下运行，这是要防止主数据库中存在直接的数据修改而不记录日志的行为。
检查强制日志模式如下：
SQL> select dbid,name,force_logging from v$database;
DBID NAME FORCE_LOGGING
---------- --------- ---------------------------------------
1565839253 ORCL NO启动强制日志模式如下：
SQL> alter database force logging;
Database altered.取消强制日志模式如下：
SQL> alter database no force logging;
Database altered.2）其次，检查主数据库的日志运行模式，Data Guard要求主数据库必须在归档模式下运行，此模式下数据库可以连续完整的保存事务日志。
SQL> archive log list
Database log mode No Archive Mode
Automatic archival Disabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 11
Current log sequence 13如果数据库处在非归档模式，则需要做如下调整：
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 1241513984 bytes
Fixed Size 2923872 bytes
Variable Size 452985504 bytes
Database Buffers 771751936 bytes
Redo Buffers 13852672 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
SQL> archive log list
Database log mode Archive Mode
Automatic archival Enabled
Archive destination USE_DB_RECOVERY_FILE_DEST
Oldest online log sequence 11
Next log sequence to archive 13
Current log sequence 133）最后，要检查数据库实例的口令文件，Data Guard环境下的每个数据库必须强制使用口令文件，并且备用数据库口令文件中SYS用户的口令必须和主数据库SYS用户的口令完全一致。若没有，使用orapwd命令创建口令文件。
[oracle@sz ~]$ ll /u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcl
-rw-r----- 1 oracle oinstall 7680 Apr 18 13:41 /u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcl2.2 设置必要的主数据库参数
1）主备库架构
按照如下所示的内容构建Data Guard环境，假设一个主库在深圳，备库在上海。
|
DG ROLE |
DB_NAME |
INSTANCE_NAME |
DB_UNIQUE_NAME |
TNS_NAME |
|
主库 |
orcl |
orcl |
orcl |
shzhen |
|
备库 |
orcl |
orcldg |
orcldg |
shhai |
2）主库配置参数
orcl.__data_transfer_cache_size=0
orcl.__db_cache_size=687865856
orcl.__java_pool_size=16777216
orcl.__large_pool_size=33554432
orcl.__oracle_base=‘/u01/app/oracle‘#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=671088640
orcl.__sga_target=973078528
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=218103808
orcl.__streams_pool_size=0
*.audit_file_dest=‘/u01/app/oracle/admin/orcl/adump‘
*.audit_trail=‘db‘
*.compatible=‘12.1.0.2.0‘
*.control_files=‘/u01/app/oracle/oradata/orcl/control01.ctl‘,‘/u01/app/oracle/fast_recovery_area/orcl/control02.ctl‘
*.db_block_size=8192
*.db_domain=‘‘
*.db_name=‘orcl‘
*.db_recovery_file_dest=‘/u01/app/oracle/fast_recovery_area‘
*.db_recovery_file_dest_size=4560m
*.diagnostic_dest=‘/u01/app/oracle‘
*.dispatchers=‘(PROTOCOL=TCP) (SERVICE=orclXDB)‘
*.local_listener=‘LISTENER_ORCL‘
*.log_archive_format=‘%t_%s_%r.dbf‘
*.memory_target=1560m
*.open_cursors=300
*.processes=300
*.remote_login_passwordfile=‘EXCLUSIVE‘
*.undo_tablespace=‘UNDOTBS1‘
#############################The following is adding for DG by Alen Liu 2020-04-19####################################
DB_UNIQUE_NAME=orcl
LOG_ARCHIVE_CONFIG=‘DG_CONFIG=(orcl,orcldg)‘
LOG_ARCHIVE_DEST_1=‘LOCATION=USE_DB_RECOVERY_FILE_DEST
VALID_FOR=(ALL_LOGFILES,ALL_ROLES)
DB_UNIQUE_NAME=orcl‘
LOG_ARCHIVE_DEST_2=
‘SERVICE=shhai LGWR ASYNC
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)
DB_UNIQUE_NAME=orcldg‘
LOG_ARCHIVE_DEST_STATE_1=ENABLE
LOG_ARCHIVE_DEST_STATE_2=ENABLE
REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE
STANDBY_FILE_MANAGEMENT=AUTO
FAL_SERVER=orcldg
FAL_CLIENT=orcl
DB_FILE_NAME_CONVERT=‘/u01/app/oracle/oradata/orcldg‘,‘/u01/app/oracle/oradata/orcl‘
LOG_FILE_NAME_CONVERT=‘/u01/app/oracle/oradata/orcldg‘,‘/u01/app/oracle/oradata/orcl‘
#############################The following is adding for DG by Alen Liu 2020-04-19####################################3）设置网络配置
[oracle@sz admin]$ cat tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
SHHAI =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.103)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcldg)
)
)
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = sz.oracle.com)(PORT = 1521))
SHZHEN =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.102)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = sz.oracle.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)3 备用数据库配置
3.1 配置密码文件
将主库的密码文件拷贝至备库，并修改名称。
1）主库传送文件
[oracle@sz dbs]$ scp orapworcl oracle@192.168.56.103:$ORACLE_HOME/dbs/orapworcldg
oracle@192.168.56.103‘s password:
orapworcl 100% 7680 7.5KB/s 00:002）备库检查文件
[oracle@sh ~]$ ll /u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcldg
-rw-r----- 1 oracle oinstall 7680 Apr 19 17:28 /u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcldg3.2 设置网络配置
将主库的设置好的网络文件拷贝至备库。
1）主库传送文件
[oracle@sz admin]$ scp tnsnames.ora oracle@192.168.56.103:/u01/app/oracle/product/12.1.0/dbhome_1/network/admin/
oracle@192.168.56.103‘s password:
tnsnames.ora 100% 809 0.8KB/s 00:002）备库检查文件
[oracle@sh ~]$ cat /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora
# tnsnames.ora Network Configuration File: /u01/app/oracle/product/12.1.0/dbhome_1/network/admin/tnsnames.ora
# Generated by Oracle configuration tools.
SHHAI =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.103)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcldg)
)
)
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = sh.oracle.com)(PORT = 1521))
SHZHEN =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.56.102)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = orcl)
)
)
ORCL =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = sz.oracle.com)(PORT = 1521))
)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
)
)3.3 设置初始化参数文件
1）将主库的pfile传送至备库，并做适当调整。
[oracle@sz dbs]$ scp initorcl.ora oracle@192.168.56.103:$ORACLE_HOME/dbs/initorcldg.ora
The authenticity of host ‘192.168.56.103 (192.168.56.103)‘ can‘t be established.
RSA key fingerprint is bd:22:31:30:20:8f:b1:12:3a:0c:dd:db:5b:f0:8f:12.
Are you sure you want to continue connecting (yes/no)? yes
Warning: Permanently added ‘192.168.56.103‘ (RSA) to the list of known hosts.
oracle@192.168.56.103‘s password:
initorcl.ora 100% 1869 1.8KB/s 00:002）检查备库文件
[oracle@sh dbs]$ cat initorcldg.ora
orcl.__data_transfer_cache_size=0
orcl.__db_cache_size=687865856
orcl.__java_pool_size=16777216
orcl.__large_pool_size=33554432
orcl.__oracle_base=‘/u01/app/oracle‘#ORACLE_BASE set from environment
orcl.__pga_aggregate_target=671088640
orcl.__sga_target=973078528
orcl.__shared_io_pool_size=0
orcl.__shared_pool_size=218103808
orcl.__streams_pool_size=0
*.audit_file_dest=‘/u01/app/oracle/admin/orcldg/adump‘
*.audit_trail=‘db‘
*.compatible=‘12.1.0.2.0‘
#*.control_files=‘/u01/app/oracle/oradata/orcl/control01.ctl‘,‘/u01/app/oracle/fast_recovery_area/orcl/control02.ctl‘
*.db_block_size=8192
*.db_domain=‘‘
*.db_name=‘orcl‘
*.db_recovery_file_dest=‘/u01/app/oracle/fast_recovery_area‘
*.db_recovery_file_dest_size=4560m
*.diagnostic_dest=‘/u01/app/oracle‘
*.dispatchers=‘(PROTOCOL=TCP) (SERVICE=orclXDB)‘
*.local_listener=‘LISTENER_ORCL‘
*.log_archive_format=‘%t_%s_%r.dbf‘
*.memory_target=1560m
*.open_cursors=300
*.processes=300
*.remote_login_passwordfile=‘EXCLUSIVE‘
*.undo_tablespace=‘UNDOTBS1‘
#############################The following is adding for DG by Alen Liu 2017-09-11####################################
DB_UNIQUE_NAME=orcldg
LOG_ARCHIVE_CONFIG=‘DG_CONFIG=(orcl,orcldg)‘
LOG_ARCHIVE_DEST_1=‘LOCATION=USE_DB_RECOVERY_FILE_DEST
VALID_FOR=(ALL_LOGFILES,ALL_ROLES)
DB_UNIQUE_NAME=orcldg‘
LOG_ARCHIVE_DEST_2=
‘SERVICE=shzhen LGWR ASYNC
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE)
DB_UNIQUE_NAME=orcl‘
LOG_ARCHIVE_DEST_STATE_1=ENABLE
LOG_ARCHIVE_DEST_STATE_2=ENABLE
REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE
STANDBY_FILE_MANAGEMENT=AUTO
FAL_SERVER=orcl
FAL_CLIENT=orcldg
DB_FILE_NAME_CONVERT=‘/u01/app/oracle/oradata/orcl‘,‘/u01/app/oracle/oradata/orcldg‘
LOG_FILE_NAME_CONVERT=‘/u01/app/oracle/oradata/orcl‘,‘/u01/app/oracle/oradata/orcldg‘
#############################The following is adding for DG by Alen Liu 2017-09-11####################################4 Data Guard搭建
4.1 主库使用新创建的配置文件
SQL> startup
ORACLE instance started.
Total System Global Area 1644167168 bytes
Fixed Size 2925024 bytes
Variable Size 1056968224 bytes
Database Buffers 570425344 bytes
Redo Buffers 13848576 bytes
Database mounted.
Database opened.
SQL> create spfile from pfile;
File created.4.2 备库启动至NOMOUNT状态
SQL> startup nomount
ORACLE instance started.
Total System Global Area 1644167168 bytes
Fixed Size 2925024 bytes
Variable Size 1056968224 bytes
Database Buffers 570425344 bytes
Redo Buffers 13848576 bytes
SQL> create spfile from pfile;
File created.4.3 启动DUPLICATE数据库复制
[oracle@sh ~]$ rman target sys/system@shzhen auxiliary sys/system@shhai
Recovery Manager: Release 12.1.0.2.0 - Production on Sun Apr 19 17:58:55 2020
Copyright (c) 1982, 2014, Oracle and/or its affiliates. All rights reserved.
connected to target database: ORCL (DBID=1565938253)
connected to auxiliary database: ORCL (not mounted)
RMAN> duplicate target database for standby from active database dorecover nofilenamecheck;
Starting Duplicate Db at 19-APR-20
using target database control file instead of recovery catalog
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=23 device type=DISK
current log archived
contents of Memory Script:
{
backup as copy reuse
targetfile ‘/u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcl‘ auxiliary format
‘/u01/app/oracle/product/12.1.0/dbhome_1/dbs/orapworcldg‘ ;
}
executing Memory Script
Starting backup at 19-APR-20
allocated channel: ORA_DISK_1
channel ORA_DISK_1: SID=46 device type=DISK
Finished backup at 19-APR-20
contents of Memory Script:
{
sql clone "create spfile from memory";
shutdown clone immediate;
startup clone nomount;
restore clone from service ‘shzhen‘ standby controlfile;
}
executing Memory Script
sql statement: create spfile from memory
Oracle instance shut down
connected to auxiliary database (not started)
Oracle instance started
Total System Global Area 1644167168 bytes
Fixed Size 2925024 bytes
Variable Size 1073745440 bytes
Database Buffers 553648128 bytes
Redo Buffers 13848576 bytes
Starting restore at 19-APR-20
allocated channel: ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: SID=22 device type=DISK
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: restoring control file
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:02
output file name=/u01/app/oracle/fast_recovery_area/ORCLDG/controlfile/o1_mf_h9r8963y_.ctl
Finished restore at 19-APR-20
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
"/u01/app/oracle/oradata/orcldg/temp01.dbf";
switch clone tempfile all;
set newname for datafile 1 to
"/u01/app/oracle/oradata/orcldg/system01.dbf";
set newname for datafile 3 to
"/u01/app/oracle/oradata/orcldg/sysaux01.dbf";
set newname for datafile 4 to
"/u01/app/oracle/oradata/orcldg/undotbs01.dbf";
set newname for datafile 5 to
"/u01/app/oracle/oradata/orcldg/example01.dbf";
set newname for datafile 6 to
"/u01/app/oracle/oradata/orcldg/users01.dbf";
restore
from service ‘shzhen‘ clone database
;
sql ‘alter system archive log current‘;
}
executing Memory Script
executing command: SET NEWNAME
renamed tempfile 1 to /u01/app/oracle/oradata/orcldg/temp01.dbf in control file
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
executing command: SET NEWNAME
Starting restore at 19-APR-20
using channel ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00001 to /u01/app/oracle/oradata/orcldg/system01.dbf
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:25
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00003 to /u01/app/oracle/oradata/orcldg/sysaux01.dbf
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:25
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00004 to /u01/app/oracle/oradata/orcldg/undotbs01.dbf
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:07
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00005 to /u01/app/oracle/oradata/orcldg/example01.dbf
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:01:16
channel ORA_AUX_DISK_1: starting datafile backup set restore
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: specifying datafile(s) to restore from backup set
channel ORA_AUX_DISK_1: restoring datafile 00006 to /u01/app/oracle/oradata/orcldg/users01.dbf
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 19-APR-20
sql statement: alter system archive log current
current log archived
contents of Memory Script:
{
restore clone force from service ‘shzhen‘
archivelog from scn 1792397;
switch clone datafile all;
}
executing Memory Script
Starting restore at 19-APR-20
using channel ORA_AUX_DISK_1
channel ORA_AUX_DISK_1: starting archived log restore to default destination
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: restoring archived log
archived log thread=1 sequence=12
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
channel ORA_AUX_DISK_1: starting archived log restore to default destination
channel ORA_AUX_DISK_1: using network backup set from service shzhen
channel ORA_AUX_DISK_1: restoring archived log
archived log thread=1 sequence=13
channel ORA_AUX_DISK_1: restore complete, elapsed time: 00:00:01
Finished restore at 19-APR-20
datafile 1 switched to datafile copy
input datafile copy RECID=1 STAMP=1038160949 file name=/u01/app/oracle/oradata/orcldg/system01.dbf
datafile 3 switched to datafile copy
input datafile copy RECID=2 STAMP=1038160949 file name=/u01/app/oracle/oradata/orcldg/sysaux01.dbf
datafile 4 switched to datafile copy
input datafile copy RECID=3 STAMP=1038160949 file name=/u01/app/oracle/oradata/orcldg/undotbs01.dbf
datafile 5 switched to datafile copy
input datafile copy RECID=4 STAMP=1038160949 file name=/u01/app/oracle/oradata/orcldg/example01.dbf
datafile 6 switched to datafile copy
input datafile copy RECID=5 STAMP=1038160949 file name=/u01/app/oracle/oradata/orcldg/users01.dbf
contents of Memory Script:
{
set until scn 1793777;
recover
standby
clone database
delete archivelog
;
}
executing Memory Script
executing command: SET until clause
Starting recover at 19-APR-20
using channel ORA_AUX_DISK_1
starting media recovery
archived log for thread 1 with sequence 12 is already on disk as file /u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_12_h9r8fm03_.arc
archived log for thread 1 with sequence 13 is already on disk as file /u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_13_h9r8fn6x_.arc
archived log file name=/u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_12_h9r8fm03_.arc thread=1 sequence=12
archived log file name=/u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_13_h9r8fn6x_.arc thread=1 sequence=13
media recovery complete, elapsed time: 00:00:01
Finished recover at 19-APR-20
Finished Duplicate Db at 19-APR-204.4 启动备库，并查看其状态
SQL> alter database open;
Database altered.
SQL> select name,open_mode,protection_mode,database_role from v$database;
NAME OPEN_MODE PROTECTION_MODE DATABASE_ROLE
--------- -------------------- -------------------- ----------------
ORCL READ ONLY MAXIMUM PERFORMANCE PHYSICAL STANDBY4.5 备库启动Redo应用
SQL> alter database recover managed standby database disconnect from session;
Database altered.
4.6 主库创建测试数据
SQL> create table scott.test(id number,name varchar2(100));
Table created.
SQL> insert into scott.test values(1,‘Alen‘);
1 row created.
SQL> commit;
Commit complete.
SQL> alter system switch logfile;
System altered.4.7 备库验证
SQL> select * from scott.test;
ID NAME
---------- ----------------------------------------------------------------------------------------------------
1 Alen
告警日志：
alter database recover managed standby database disconnect from session
Sun Apr 19 18:15:44 2020
WARNING: There are no standby redo logs.
Standby redo logs should be configured for real time apply. Real time apply will be ignored.
Sun Apr 19 18:15:44 2020
Attempt to start background Managed Standby Recovery process (orcldg)
Starting background process MRP0
Sun Apr 19 18:15:44 2020
MRP0 started with pid=36, OS id=812
Sun Apr 19 18:15:44 2020
MRP0: Background Managed Standby Recovery process started (orcldg)
Sun Apr 19 18:15:49 2020
Serial Media Recovery started
Managed Standby Recovery not using Real Time Apply
Sun Apr 19 18:15:49 2020
Waiting for all non-current ORLs to be archived...
Sun Apr 19 18:15:49 2020
All non-current ORLs have been archived.
Sun Apr 19 18:15:49 2020
Media Recovery Log /u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_14_h9r8pmo1_.arc
Media Recovery Waiting for thread 1 sequence 15 (in transit)
Completed: alter database recover managed standby database disconnect from session
Sun Apr 19 18:16:33 2020
Archived Log entry 4 added for thread 1 sequence 15 rlc 1038157520 ID 0x5d570e4d dest 2:
RFS[1]: No standby redo logfiles created
RFS[1]: Opened log for thread 1 sequence 16 dbid 1565938253 branch 1038157520
Sun Apr 19 18:16:34 2020
Media Recovery Log /u01/app/oracle/fast_recovery_area/ORCLDG/archivelog/2020_04_19/o1_mf_1_15_h9r8rz29_.arc
Resize operation completed for file# 3, old size 675840K, new size 706560K
Media Recovery Waiting for thread 1 sequence 16 (in transit)显示没有备库standby redolog，创建即可。
WARNING: There are no standby redo logs.
SQL> alter database add standby logfile group 4 (‘/u01/app/oracle/oradata/orcl/redo04.log‘) size 50M;
Database altered.
SQL> alter database add standby logfile group 5 (‘/u01/app/oracle/oradata/orcl/redo05.log‘) size 50M;
Database altered.
SQL> alter database add standby logfile group 6 (‘/u01/app/oracle/oradata/orcl/redo06.log‘) size 50M;
Database altered.
SQL> alter database add standby logfile group 7 (‘/u01/app/oracle/oradata/orcl/redo07.log‘) size 50M;
Database altered.至此，基于DUPLICATE构建物理备用数据库完成。