再做 Oracle 11gR2 RAC+DG2
这一部分开始创建dg备库的asm磁盘组，然后执行RAC主库准备工作。
dg备库切换到grid用户,执行asmca开始配置
创建DATA磁盘组,这是将来存放数据的.
稍等片刻创建成功
用同样的方法创建FLASH磁盘组，完成如下：
dg切换到oracle用户,查看一下刚才创建的磁盘组
su -grid
sqlplus / as sysdba
select name from v$asm_diskgroup;
NAME
————————————————————————————
DATA
GRIDDG
FLASH
可见ASM磁盘组创建成功
挂载刚才创建的磁盘/dev/sde
由于格式化成了ext3分区，因此可以直接挂载到/rman_backup目录下
mount /dev/sde /rman_backup
df -h
执行chown -R oracle:oinstall /rman_backup 配置一下rman_backup的属主
至此dg备库asm磁盘组RMAN备份磁盘创建完成。
RAC主库准备
node1节点添加磁盘10GB，用来存放数据库全备，控制文件，初始化文件，日志文件等。
关闭node1，为node1添加磁盘，和dg备库添加磁盘过程相同。
然后格式化成ext3文件系统，挂载到/rman_backup下，如下图所示
RAC主库具体准备工作如下：
1. RAC主库必须置为Force Logging模式
2. RAC主库必须置为归档模式
3. RAC 主库执行RMAN全备
4. RAC主库执行创建物理备库控制文件
5. RAC主库创建物理备库初始化参数文件
6. RAC主库修改口令文件,使双节点SYS用户口令一致
切换主库为Force Logging模式
执行如下操作：
node1 -> su – oracle
Password:
node1 -> sqlplus
SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 15 21:22:12 2016
Copyright (c) 1982, 2009, Oracle. All rights reserved.
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.1.0 – 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, OLAP,
Data Mining and Real Application Testing options
SQL> select name, log_mode , force_logging from gv$database;
NAME LOG_MODE FOR
——— ———— —
DEVDB NOARCHIVELOG NO
DEVDB NOARCHIVELOG NO
SQL> alter database force logging;
Database altered.
SQL> select name, log_mode , force_logging from gv$database;
NAME LOG_MODE FOR
——— ———— —
DEVDB NOARCHIVELOG YES
DEVDB NOARCHIVELOG YES
现在发现Force Logging生效了。
RAC主库修改为归档模式
这里我们需要通过grid来打开和关闭数据库
su – grid
crs_stat -t 查看数据库状态
srvctl stop database -d devdb 关闭实例
查看实例状态
srvctl status database -d devdb
node1切换日志模式为arvhivelog
su – oracle
sqlplus
starup mount;
select open_mode , log_mode from v$database;
alter database archivelog;
select open_mode , log_mode from v$database;
shutdown immidiate;
再次切换到grid用户，然后打开数据库
su – grid
srvctl start database -d devdb
crs_stat -t
su – oracle
sqlplus
select name , log_mode , force_loggging from gv$database;
可以看出LOG_MODE已经变成了archivelog了。
RAC主库RMAN全备
su – oracle
rman target /
然后写一个RMAN全备脚本执行即可完成数据库全备
RMAN> run {
allocate channel c1 type disk;
allocate channel c2 type disk;
allocate channel c3 type disk;
backup database format ‘/rman_backup/Full_%U.bak’;
release channel c1;
release channel c2;
release channel c3;
}
backup archivelog all format ‘/rman_backup/ARC_%U.bak’;
执行成功，数据库备份到了/rman_backup/目录，如下:
主库创建备库的控制文件
RMAN> backup device type disk format ‘/rman_backup/standby_%U.ctl’ current controlfile for standby;
Starting backup at 2016/06/17 00:01:09
using channel ORA_DISK_1
channel ORA_DISK_1: starting full datafile backup set
channel ORA_DISK_1: specifying datafile(s) in backup set
including standby control file in backup set
channel ORA_DISK_1: starting piece 1 at 2016/06/17 00:01:12
channel ORA_DISK_1: finished piece 1 at 2016/06/17 00:01:14
piece handle=/rman_backup/standby_0fr8au65_1_1.ctl tag=TAG20160617T000109 comment=NONE
channel ORA_DISK_1: backup set complete, elapsed time: 00:00:03
Finished backup at 2016/06/17 00:01:15
执行成功
/rman_backup目录已经存在了控制文件standby_0fr8au65_1_1.ctl
RAC主库创建备库的初始化文件
node1切换到oracle用户,并用sqlplus登录
su – oracle
sqlplus
create pfile=’/rman_backup/initphydb.ora’ from spfile; 将初始化文件放到/rman_backup目录下，以后还需要修改
rman_backup目录中已经出现initphydb.ora初始化文件了
RAC主库修改SYS口令,和dg备库的SYS口令一致.
node1和node2切换到oracle用户sqlplus后，执行
alter user sys identified by Oracle168;
即可修改口令文件
验证口令文件是否有效，这里必须编辑node1和node2的tnsnames.ora文件
node1的tnsnames.ora中添加
devdb2 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.137.152)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = devdb)
(INSTANCE_NAME = devdb2)
)
)
node1的tnsnames.ora中添加
devdb1 =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.137.151)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = devdb)
(INSTANCE_NAME = devdb1)
)
)
保存退出
node1和node2上分别测试登陆对方
node1上
conn sys/Oracle168@devdb2 as sysdba
node2上
conn sys/Oracle168@devdb1 as sysdba
至此RAC主库准备完成.