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oracle 11g R2 rac配置FAT

2018-01-31 16:35 495 查看
You know some birds are not meant to be caged, their feathers are just too bright.------《肖申克的救赎》



Oracle从11g R2开始推出SCAN(Single Client Access Name),客户端可以通过SCAN特性负载均衡地连接到RAC数据库。SCAN是一个域名,可以解析至少1个IP,最多解析3个SCAN IP,客户端可以通过这个SCAN 名字来访问数据库,另外SCAN ip必须与public ip和VIP在一个子网。SCAN可以通过DNS和GNS解析,也可以使用hosts文件来解析。但由于DNS及GNS和网络管理系统密切地结合在一起。对于多层的应用系统而言,这种配置将故障点又扩展到网络层了。哪天DNS 服务器解析不了,就会导致RAC 不能访问。而使用hosts文件来解析在安装RAC的时候产生问题,后期使用也是存在问题的,比如SCAN域名只能定义一个SCAN
IP。故在此列出oracle 11g R2的FAT配置流程,来实现rac的负载均衡:

一、基础环境

1,11gR2 双节点rac

2,oracle linux 6.5操作系统

3,hosts文件地址配置

192.168.1.10   mydb01

192.168.1.11   mydb02

192.168.1.12   mydb01-vip

192.168.1.13   mydb02-vip

10.1.1.10         mydb01-priv

10.1.1.11         mydb02-priv

192.168.1.14    mydb-scan

二、服务器端配置

1,节点1和节点2加入以下配置信息

MYDB =

  (DESCRIPTION =

   
f2e2
(ADDRESS = (PROTOCOL = TCP)(HOST = mydb-scan)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = mydb)

    )

  )

LISTENERS_MYDB =

  (ADDRESS_LIST =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.12)(PORT = 1521))

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.13)(PORT = 1521))

  )

mydb1 =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.12)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = mydb)

      (INSTANCE_NAME = mydb1)

    )

  )

mydb2 =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.13)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = mydb)

      (INSTANCE_NAME = mydb2)

    )

  )

2,修改系统参数

  alter system set remote_listener='LISTENERS_MYDB' scope=both sid='*';----所有实例都生效

  alter system set local_listener='mydb2' sid='mydb2';

  alter system set local_listener='mydb1' sid='mydb1';

3,节点1和节点2进行动态注册

   alter system register;

4,节点1和节点2重启listener

   srvctl stop listener -n mydb02

   srvctl stop listener -n mydb01

   srvctl start listener -n mydb02

   srvctl start listener -n mydb01

5,客户端tnsnames.ora进行配置

   mydb =

  (DESCRIPTION =

    (LOAD_BALANCE = yes)

    (failover=on)

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.12)(PORT = 1521))

    (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.13)(PORT = 1521))

     (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = mydb)

     (failover_mode=(type=select)(method=basic)(retries=5)(delay=5))

    )

  )

最后只要测试连接即可!

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标签:  oracle 11g R2 FAT tnsnames