为一个RAC搭建standby和单节点搭建方法基本一致，我们可以把RAC看成是一个单节点的数据库，只需要保证所有节点的日志能传送到备库即可。
一、在备库服务器安装ORACLE软件
只安装软件，不要创建数据库。ORACLE软件版本和主库保持一致。
二、修改主库参数
节点1执行：
SQL> show parameter spfile
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string /dev/raw/raw14
节点2执行：
SQL> show parameter spfile
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
spfile string /dev/raw/raw14
可见，在本例中，RAC各节点共用一个spfile，所以，我们修改参数时，可以只需在一个节点下修改就可以了。
--强制数据库LOGGING
SQL> ALTER DATABASE FORCE LOGGING;
Database altered.
--修改DATAGUARD相关参数
SQL> ALTER SYSTEM SET DB_UNIQUE_NAME=primary scope=spfile;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_CONFIG='DG_CONFIG=(primary,standby)' scope=spfile;
System altered.
SQL> ALTER SYSTEM SET
LOG_ARCHIVE_DEST_1='LOCATION=/soft/archivelog/
VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=primary' scope=spfile;
System altered.
SQL> ALTER SYSTEM SET
LOG_ARCHIVE_DEST_2='SERVICE=standby LGWR ASYNC
VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=standby'
scope=spfile;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_1=ENABLE scope=spfile;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_DEST_STATE_2=ENABLE scope=spfile;
System altered.
SQL> ALTER SYSTEM SET REMOTE_LOGIN_PASSWORDFILE=EXCLUSIVE scope=spfile;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_FORMAT='%t_%s_%r.arc' scope=spfile;
System altered.
SQL> ALTER SYSTEM SET LOG_ARCHIVE_MAX_PROCESSES=4 scope=spfile;
System altered.
SQL> ALTER SYSTEM SET COMPATIBLE = '10.2.0.3' scope=spfile;
System altered.
--以下几个参数是为了SWITCH OVER用的，是可选参数。
--但是为了以后可能发生的SWITCH OVER更方便，应该养成设置这些参数的习惯
SQL> ALTER SYSTEM SET FAL_CLIENT = PRIMARY SCOPE=SPFILE;
System altered.
SQL> ALTER SYSTEM SET FAL_SERVER = STANDBY SCOPE=SPFILE;
System altered.
SQL> ALTER SYSTEM SET STANDBY_FILE_MANAGEMENT =AUTO SCOPE=SPFILE;
System altered.
SQL> ALTER SYSTEM SET DB_FILE_NAME_CONVERT='/soft/oradata/rac/','/dev/raw/' SCOPE=SPFILE;
System altered.
SQL> ALTER SYSTEM SET LOG_FILE_NAME_CONVERT='/soft/oradata/rac/','/dev/raw/' SCOPE=SPFILE;
System altered.
--在本文测试环境下，由于主库和备库路径不一致，所以要设置路径转换参数。
三、修改主库为归档模式
1、--关闭所有实例
--注意：修改以上参数后，必须把所有实例都关闭。否则在启动实例的时候可能会导致错误：
--ORA-00600: internal error code, arguments: [kccsbck_first], [2], [2241198041],
[], [], [], [], []
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
2、修改为归档模式
--关闭所有节点
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
--在其中一个节点启用归档
SQL> startup mount
ORACLE instance started.
Total System Global Area 159383552 bytes
Fixed Size 1260672 bytes
Variable Size 79692672 bytes
Database Buffers 75497472 bytes
Redo Buffers 2932736 bytes
Database mounted.
SQL> alter database archivelog;
Database altered.
SQL> alter database open;
Database altered.
10GR2以前，在RAC环境下修改归档必须先把设置参数cluster_database=false，把数据库设置为归档后再把该参数设置为true，但这个步骤在10GR2可以省略。
四、备份数据库
1、备份数据库
备份操作在节点1(rac1)上执行。
由于归档在不同的节点下，故要连接所有节点进行备份：
[oracle@rac1 ~]$ $ORACLE_HOME/bin/rman target /
Recovery Manager: Release 10.2.0.3.0 - Production on Wed Apr 30 14:48:23 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: RAC (DBID=2232067446)
RMAN> run
2> {
3> allocate channel c1 device type disk format '/soft/backup/%U' connect sys/test@rac1;
4> allocate channel c2 device type disk format '/soft/backup/%U' connect sys/test@rac2;
5> backup database plus archivelog delete all input;
6> }
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: sid=134 instance=rac1 devtype=DISK
allocated channel: c2
channel c2: sid=141 instance=rac2 devtype=DISK
Starting backup at 30-APR-08
current log archived
channel c1: starting archive log backupset
channel c1: specifying archive log(s) in backup set
input archive log thread=1 sequence=80 recid=1 stamp=653247673
input archive log thread=1 sequence=81 recid=4 stamp=653268228
input archive log thread=1 sequence=82 recid=5 stamp=653353066
channel c1: starting piece 1 at 30-APR-08
channel c2: starting archive log backupset
channel c2: specifying archive log(s) in backup set
input archive log thread=1 sequence=85 recid=13 stamp=653409646
input archive log thread=2 sequence=42 recid=2 stamp=653248818
input archive log thread=2 sequence=43 recid=3 stamp=653250118
input archive log thread=2 sequence=46 recid=10 stamp=653353763
input archive log thread=2 sequence=47 recid=11 stamp=653354798
input archive log thread=2 sequence=48 recid=12 stamp=653409644
input archive log thread=2 sequence=49 recid=16 stamp=653410122
channel c2: starting piece 1 at 30-APR-08
channel c2: finished piece 1 at 30-APR-08
piece handle=/soft/backup/02jf4fql_1_1 tag=TAG20080430T144854 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:05
channel c2: deleting archive log(s)
archive log filename=/soft/archivelog/1_85_644085430.arc recid=13 stamp=653409646
archive log filename=/soft/archivelog/2_42_644085430.arc recid=2 stamp=653248818
archive log filename=/soft/archivelog/2_43_644085430.arc recid=3 stamp=653250118
archive log filename=/soft/archivelog/2_46_644085430.arc recid=10 stamp=653353763
archive log filename=/soft/archivelog/2_47_644085430.arc recid=11 stamp=653354798
archive log filename=/soft/archivelog/2_48_644085430.arc recid=12 stamp=653409644
archive log filename=/soft/archivelog/2_49_644085430.arc recid=16 stamp=653410122
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/01jf4fqq_1_1 tag=TAG20080430T144854 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:14
channel c1: deleting archive log(s)
archive log filename=/soft/archivelog/1_80_644085430.arc recid=1 stamp=653247673
archive log filename=/soft/archivelog/1_81_644085430.arc recid=4 stamp=653268228
archive log filename=/soft/archivelog/1_82_644085430.arc recid=5 stamp=653353066
channel c1: starting archive log backupset
channel c1: specifying archive log(s) in backup set
input archive log thread=1 sequence=83 recid=6 stamp=653353068
input archive log thread=1 sequence=84 recid=9 stamp=653353575
input archive log thread=1 sequence=86 recid=14 stamp=653409966
input archive log thread=1 sequence=87 recid=15 stamp=653410123
input archive log thread=2 sequence=44 recid=7 stamp=653353071
input archive log thread=2 sequence=45 recid=8 stamp=653353072
channel c1: starting piece 1 at 30-APR-08
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/03jf4fr9_1_1 tag=TAG20080430T144854 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:02
channel c1: deleting archive log(s)
archive log filename=/soft/archivelog/1_83_644085430.arc recid=6 stamp=653353068
archive log filename=/soft/archivelog/1_84_644085430.arc recid=9 stamp=653353575
archive log filename=/soft/archivelog/1_86_644085430.arc recid=14 stamp=653409966
archive log filename=/soft/archivelog/1_87_644085430.arc recid=15 stamp=653410123
archive log filename=/soft/archivelog/2_44_644085430.arc recid=7 stamp=653353071
archive log filename=/soft/archivelog/2_45_644085430.arc recid=8 stamp=653353072
Finished backup at 30-APR-08
Starting backup at 30-APR-08
channel c1: starting full datafile backupset
channel c1: specifying datafile(s) in backupset
input datafile fno=00001 name=/dev/raw/raw1
input datafile fno=00005 name=/dev/raw/raw7
input datafile fno=00003 name=/dev/raw/raw2
channel c1: starting piece 1 at 30-APR-08
channel c2: starting full datafile backupset
channel c2: specifying datafile(s) in backupset
input datafile fno=00002 name=/dev/raw/raw3
input datafile fno=00004 name=/dev/raw/raw5
channel c2: starting piece 1 at 30-APR-08
channel c2: finished piece 1 at 30-APR-08
piece handle=/soft/backup/05jf4frg_1_1 tag=TAG20080430T144919 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:43
channel c2: starting full datafile backupset
channel c2: specifying datafile(s) in backupset
including current control file in backupset
channel c2: starting piece 1 at 30-APR-08
channel c2: finished piece 1 at 30-APR-08
piece handle=/soft/backup/06jf4ft0_1_1 tag=TAG20080430T144919 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:22
channel c2: starting full datafile backupset
channel c2: specifying datafile(s) in backupset
including current SPFILE in backupset
channel c2: starting piece 1 at 30-APR-08
channel c2: finished piece 1 at 30-APR-08
piece handle=/soft/backup/07jf4ftm_1_1 tag=TAG20080430T144919 comment=NONE
channel c2: backup set complete, elapsed time: 00:00:06
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/04jf4frg_1_1 tag=TAG20080430T144919 comment=NONE
channel c1: backup set complete, elapsed time: 00:01:13
Finished backup at 30-APR-08
Starting backup at 30-APR-08
current log archived
channel c1: starting archive log backupset
channel c1: specifying archive log(s) in backup set
input archive log thread=1 sequence=88 recid=17 stamp=653410237
channel c1: starting piece 1 at 30-APR-08
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/08jf4fv9_1_1 tag=TAG20080430T145120 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:04
channel c1: deleting archive log(s)
archive log filename=/soft/archivelog/1_88_644085430.arc recid=17 stamp=653410237
channel c1: starting archive log backupset
channel c1: specifying archive log(s) in backup set
input archive log thread=2 sequence=50 recid=18 stamp=653410279
channel c1: starting piece 1 at 30-APR-08
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/09jf4fvf_1_1 tag=TAG20080430T145120 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:04
channel c1: deleting archive log(s)
archive log filename=/soft/archivelog/2_50_644085430.arc recid=18 stamp=653410279
Finished backup at 30-APR-08
released channel: c1
released channel: c2
2、生成备库控制文件
RMAN> run
2> {
3> allocate channel c1 device type disk format '/soft/backup/CON_%U';
4> backup current controlfile for standby;
5> }
allocated channel: c1
channel c1: sid=131 instance=rac1 devtype=DISK
Starting backup at 30-APR-08
channel c1: starting full datafile backupset
channel c1: specifying datafile(s) in backupset
including standby control file in backupset
channel c1: starting piece 1 at 30-APR-08
channel c1: finished piece 1 at 30-APR-08
piece handle=/soft/backup/CON_0ajf4gqi_1_1 tag=TAG20080430T150554 comment=NONE
channel c1: backup set complete, elapsed time: 00:00:12
Finished backup at 30-APR-08
released channel: c1
为一个RAC搭建standby和单节点搭建方法基本一致，我们可以把RAC看成是一个单节点的数据库，只需要保证所有节点的日志能传送到备库即可。
五、备库环境准备
1、在备库添加指向主库的tnsnames
在备库的tnsnames.ora添加如下内容：
primary =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 200.200.200.11)(PORT = 1521))
(ADDRESS = (PROTOCOL = TCP)(HOST = 200.200.200.22)(PORT = 1521))
(LOAD_BALANCE = yes)
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = primary)
(FAILOVER_MODE =
(TYPE = SELECT)
(METHOD = BASIC)
(RETRIES = 180)
(DELAY = 5)
)
)
)2、在备库创建相关目录
包括adump,bdump,cdump,udump及数据文件目录等。
3、拷贝主库的密码文件到备库上
--拷贝rac1的密码文件到备库的$ORACLE_HOME/dbs下，并把该密码文件修改为orapwd<sid>。这里我的sid就用rac1，所以，不用改名。
[oracle@rac1 dbs]$ scp orapwrac1 172.25.0.35:`pwd`
orapwrac1 100% 1536 1.5KB/s 00:00
4、配置备库的监听
[oracle@standby admin]$ more listener.ora
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(GLOBAL_DBNAME = standby)
(ORACLE_HOME = /opt/oracle/product/10.2/database)
(SID_NAME = rac1)
)
)
LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = standby)(PORT = 1521))
)
(DESCRIPTION =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC))
)
)
启动备库监听：lsnrctl start
5、设置备库参数文件
从主库rac1上根据spfile创建一个pfile文件，并传到备库上。
SQL> create pfile from spfile;
File created.
SQL> exit
Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Real Application Clusters and Data Mining options
[oracle@rac1 ~]$ cd $ORACLE_HOME/dbs
[oracle@rac1 dbs]$ scp initrac1.ora 172.25.0.35:`pwd`
initrac1.ora
在备库上修改参数文件：
Ø 删除所有非"*"打头的参数设置及rac相关参数
Ø 设置dataguard参数
修改后参数如下：
[oracle@standby dbs]$ more initrac1.ora
*.audit_file_dest='/opt/oracle/admin/rac/adump'
*.background_dump_dest='/opt/oracle/admin/rac/bdump'
*.compatible='10.2.0.3'
*.control_files='/soft/oradata/rac/control01.ctl','/soft/oradata/rac/control02.ctl','/soft/oradata/rac/control03.ctl'
*.core_dump_dest='/opt/oracle/admin/rac/cdump'
*.db_block_size=8192
*.db_domain=''
*.db_file_multiblock_read_count=16
*.db_file_name_convert='/DEV/RAW/','/SOFT/ORADATA/RAC/'
*.db_name='rac'
*.db_unique_name='STANDBY'
*.fal_client='STANDBY'
*.fal_server='PRIMARY'
*.job_queue_processes=10
*.log_archive_config='DG_CONFIG=(primary,standby)'
*.log_archive_dest_1='LOCATION= /soft/oradata/archivelog/ VALID_FOR=(ALL_LOGFILES,ALL_ROLES) DB_UNIQUE_NAME=standby'
*.log_archive_dest_2='SERVICE=primary LGWR ASYNC VALID_FOR=(ONLINE_LOGFILES,PRIMARY_ROLE) DB_UNIQUE_NAME=primary'
*.log_archive_dest_state_1='ENABLE'
*.log_archive_dest_state_2='ENABLE'
*.log_archive_format='%t_%s_%r.arc'
*.log_archive_max_processes=4
*.log_file_name_convert='/DEV/RAW/','/SOFT/ORADATA/RAC/'
*.open_cursors=300
*.pga_aggregate_target=16777216
*.processes=150
*.remote_login_passwordfile='EXCLUSIVE'
*.sga_max_size=157286400
*.sga_target=157286400
*.standby_file_management='AUTO'
*.undo_management='AUTO'
undo_tablespace='UNDOTBS1'
*.user_dump_dest='/opt/oracle/admin/rac/udump'
以上有些参数非必须设置的，但是为了switchover更方便，建议都修改上。
Undo表空间保留其中一个就可以。
路径转换相关参数要设置对，否则会报错。
6、把备库启动到nomount状态
[oracle@standby ~]$ sqlplus "/as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Wed Apr 30 18:42:39 2008
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to an idle instance.
SQL> startup nomount
ORACLE instance started.
Total System Global Area 159383552 bytes
Fixed Size 1260672 bytes
Variable Size 62915456 bytes
Database Buffers 92274688 bytes
Redo Buffers 2932736 bytes
7、从主库拷贝备份到备库上
之前备份的所有文件都拷贝到备库上，路径要和主库备份路径保持一致。如果不一致，linux下可以用ln的方式解决。
注意：两个节点都有归档的备份，要把这些备份都拷贝到备库上。
RAC1：
[oracle@rac1 backup]$ scp * 172.25.0.35:`pwd`
01jf4fqq_1_1 100% 23MB 3.8MB/s 00:06
03jf4fr9_1_1 100% 194KB 194.0KB/s 00:00
04jf4frg_1_1 100% 315MB 3.4MB/s 01:34
08jf4fv9_1_1 100% 13KB 13.0KB/s 00:00
09jf4fvf_1_1 100% 4608 4.5KB/s 00:00
CON_0ajf4gqi_1_1 100% 15MB 3.7MB/s 00:04
RAC2：
[oracle@rac2 backup]$ scp * 172.25.0.35:`pwd`
02jf4fql_1_1 100% 7145KB 3.5MB/s 00:02
05jf4frg_1_1 100% 175MB 3.4MB/s 00:52
06jf4ft0_1_1 100% 15MB 1.5MB/s 00:10
07jf4ftm_1_1 100% 96KB 96.0KB/s 00:00
、恢复备库
1、在主库添加指向备库的tnsname
在主库的tnsnames.ora添加如下内容：
STANDBY =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST =200.200.200.123)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = standby)
)
2、在主库执行，利用auxiliary来恢复备库
[oracle@rac1 ~]$ $ORACLE_HOME/bin/rman target / auxiliary sys/6212327@standby
Recovery Manager: Release 10.2.0.3.0 - Production on Wed Apr 30 19:37:05 2008
Copyright (c) 1982, 2005, Oracle. All rights reserved.
connected to target database: RAC (DBID=2232067446)
connected to auxiliary database: RAC (not mounted)
RMAN> run
{
allocate channel c1 device type disk format '/soft/backup/%U' connect sys/6212327@rac1;
2> 3> 4> allocate channel c2 device type disk format '/soft/backup/%U' connect sys/6212327@rac2;
5> allocate auxiliary channel ac1 device type disk format '/soft/backup/%U';
6> allocate auxiliary channel ac2 device type disk format '/soft/backup/%U';
7> duplicate target database for standby;
8> }
using target database control file instead of recovery catalog
allocated channel: c1
channel c1: sid=132 instance=rac1 devtype=DISK
allocated channel: c2
channel c2: sid=134 instance=rac2 devtype=DISK
allocated channel: ac1
channel ac1: sid=155 devtype=DISK
allocated channel: ac2
channel ac2: sid=154 devtype=DISK
Starting Duplicate Db at 30-APR-08
contents of Memory Script:
{
restore clone standby controlfile;
sql clone 'alter database mount standby database';
}
executing Memory Script
Starting restore at 30-APR-08
channel ac1: starting datafile backupset restore
channel ac1: restoring control file
channel ac1: reading from backup piece /soft/backup/CON_0ajf4gqi_1_1
channel ac1: restored backup piece 1
piece handle=/soft/backup/CON_0ajf4gqi_1_1 tag=TAG20080430T150554
channel ac1: restore complete, elapsed time: 00:00:04
output filename=/soft/oradata/rac/control01.ctl
output filename=/soft/oradata/rac/control02.ctl
output filename=/soft/oradata/rac/control03.ctl
Finished restore at 30-APR-08
sql statement: alter database mount standby database
contents of Memory Script:
{
set newname for tempfile 1 to
"/soft/oradata/rac/raw6";
switch clone tempfile all;
set newname for datafile 1 to
"/soft/oradata/rac/raw1";
set newname for datafile 2 to
"/soft/oradata/rac/raw3";
set newname for datafile 3 to
"/soft/oradata/rac/raw2";
set newname for datafile 4 to
"/soft/oradata/rac/raw5";
set newname for datafile 5 to
"/soft/oradata/rac/raw7";
restore
check readonly
clone database
;
}
executing Memory Script
executing command: SET NEWNAME
renamed temporary file 1 to /soft/oradata/rac/raw6 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 30-APR-08
channel ac1: starting datafile backupset restore
channel ac1: specifying datafile(s) to restore from backup set
restoring datafile 00002 to /soft/oradata/rac/raw3
restoring datafile 00004 to /soft/oradata/rac/raw5
channel ac1: reading from backup piece /soft/backup/05jf4frg_1_1
channel ac2: starting datafile backupset restore
channel ac2: specifying datafile(s) to restore from backup set
restoring datafile 00001 to /soft/oradata/rac/raw1
restoring datafile 00003 to /soft/oradata/rac/raw2
restoring datafile 00005 to /soft/oradata/rac/raw7
channel ac2: reading from backup piece /soft/backup/04jf4frg_1_1
channel ac1: restored backup piece 1
piece handle=/soft/backup/05jf4frg_1_1 tag=TAG20080430T144919
channel ac1: restore complete, elapsed time: 00:01:22
channel ac2: restored backup piece 1
piece handle=/soft/backup/04jf4frg_1_1 tag=TAG20080430T144919
channel ac2: restore complete, elapsed time: 00:01:32
Finished restore at 30-APR-08
contents of Memory Script:
{
switch clone datafile all;
}
executing Memory Script
datafile 1 switched to datafile copy
input datafile copy recid=6 stamp=653426781 filename=/soft/oradata/rac/raw1
datafile 2 switched to datafile copy
input datafile copy recid=7 stamp=653426781 filename=/soft/oradata/rac/raw3
datafile 3 switched to datafile copy
input datafile copy recid=8 stamp=653426781 filename=/soft/oradata/rac/raw2
datafile 4 switched to datafile copy
input datafile copy recid=9 stamp=653426781 filename=/soft/oradata/rac/raw5
datafile 5 switched to datafile copy
input datafile copy recid=10 stamp=653426781 filename=/soft/oradata/rac/raw7
Finished Duplicate Db at 30-APR-08
released channel: c1
released channel: c2
released channel: ac1
released channel: ac2
从日志可以看到，oracle先根据参数文件把控制文件恢复到合适位置，然后再根据db_file_name_cover把数据文件恢复到合适位置。
七、后续工作
1、把备库至于恢复状态：
[oracle@standby admin]$ sqlplus "/as sysdba"
SQL*Plus: Release 10.2.0.3.0 - Production on Wed Apr 30 19:40:59 2008
Copyright (c) 1982, 2006, Oracle. All Rights Reserved.
Connected to:
Oracle Database 10g Enterprise Edition Release 10.2.0.3.0 - Production
With the Partitioning, Oracle Label Security and Data Mining options
SQL> alter database recover managed standby database disconnect from session;
Database altered
此时观察备库的alert文件，可以发现有很多类似的信息：
Errors in file /opt/oracle/admin/rac/bdump/rac1_mrp0_10825.trc:
ORA-00313: open failed for members of log group 4 of thread 2
ORA-00312: online log 4 thread 2: '/soft/oradata/rac/raw11'
ORA-27037: unable to obtain file status
Linux Error: 2: No such file or directory
Additional information: 3
Clearing online redo logfile 4 /soft/oradata/rac/raw11
Clearing online log 4 of thread 2 sequence number 50
这是正常的，在第一次置于recover状态的时候，备库会生成对应的online redo log。
2、在备库添加standby redo log
Standby redo log比archivelog方式有更大的优势，且在最大保护、最大可用、实时恢复的情况下必须有standby redo log。
Standby redo log的组数一般为(N +1)* thread# （N分别为每个thread#的联机日志组数）。在本例，每一个thread的联机日志都是2组，所以，需要添加6组standby redo log：
SQL> alter database recover managed standby database cancel;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 ('/soft/oradata/rac/slog4.ora') SIZE 52428800;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 ('/soft/oradata/rac/slog5.ora') SIZE 52428800;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 1 ('/soft/oradata/rac/slog6.ora') SIZE 52428800;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 2 ('/soft/oradata/rac/slog7.ora') SIZE 52428800;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 2 ('/soft/oradata/rac/slog8.ora') SIZE 52428800;
Database altered.
SQL> ALTER DATABASE ADD STANDBY LOGFILE THREAD 2 ('/soft/oradata/rac/slog9.ora') SIZE 52428800;
Database altered.
注意：standby redo log的大小必须和联机日志一样。
七、遇到的问题
1、FAL[client, MRP0]: Error 12545 connecting to PRIMARY for fetching gap sequence
Wed Apr 30 20:21:23 2008
Errors in file /opt/oracle/admin/rac/bdump/rac1_mrp0_10965.trc:
ORA-12545: Connect failed because target host or object does not exist
Wed Apr 30 20:22:23 2008
FAL[client]: Failed to request gap sequence
GAP - thread 1 sequence 88-88
DBID 2232067446 branch 644085430
FAL[client]: All defined FAL servers have been attempted.
这个问题和gap有关， 备库尝试拿gap的时候，发现不能连接主库。这个问题是RAC的监听造成的，参考yangtingkun的解决方法，修改两个参数即可：
ALTER SYSTEM SET LOCAL_LISTENER = '(ADDRESS = (PROTOCOL = TCP)(HOST = 200.200.200.11)(PORT = 1521))' SID = 'rac1';
ALTER SYSTEM SET LOCAL_LISTENER = '(ADDRESS = (PROTOCOL = TCP)(HOST = 200.200.200.22)(PORT = 1521))' SID = 'rac2';
2、Wed Apr 30 20:28:51 2008
FAL[client]: Failed to request gap sequence
GAP - thread 1 sequence 88-88
DBID 2232067446 branch 644085430
FAL[client]: All defined FAL servers have been attempted.
-------------------------------------------------------------
Check that the CONTROL_FILE_RECORD_KEEP_TIME initialization
parameter is defined to a value that is sufficiently large
enough to maintain adequate log switch information to resolve
archivelog gaps.
这个问题还是和gap有关。备库现在需要从主库上拿sequence 88这个归档，但这个归档在前面做备份的时候删除了。解决方法是从备份还原这个归档：
RMAN> restore archivelog sequence 88;
Starting restore at 30-APR-08
allocated channel: ORA_DISK_1
channel ORA_DISK_1: sid=138 instance=rac1 devtype=DISK
channel ORA_DISK_1: starting archive log restore to default destination
channel ORA_DISK_1: restoring archive log
archive log thread=1 sequence=88
channel ORA_DISK_1: reading from backup piece /soft/backup/08jf4fv9_1_1
channel ORA_DISK_1: restored backup piece 1
piece handle=/soft/backup/08jf4fv9_1_1 tag=TAG20080430T145120
channel ORA_DISK_1: restore complete, elapsed time: 00:00:03
