Oracle 10g RAC 客户端连接不稳定

工作原因，近期需要安装Oracle RAC。安装中几经波折，还好主义真，最终还是扛下来了。安装后服务器端连接一切正常，但是客户端连接总是不稳定，大部分情况下能正常连接上，偶尔出现超时。客户端的tnsname.ora配置如下：

REMOTE_DCDB =

(DESCRIPTION =

(ADDRESS_LIST =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.21)(PORT = 1521))

)

(CONNECT_DATA =

(SERVICE_NAME = dcdb)

)

)

REMOTE_DCDB2 =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.22)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = dcdb)

(INSTANCE_NAME = dcdb2)

)

)

REMOTE_DCDB1 =

(DESCRIPTION =

(ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.0.21)(PORT = 1521))

(CONNECT_DATA =

(SERVER = DEDICATED)

(SERVICE_NAME = dcdb)

(INSTANCE_NAME = dcdb1)

)

)

一开始是三个都不稳定，后来是DCDB1和DCDB2稳定，但DCDB不稳定。查了很多资料，最终发现原来是hosts文件要设置下：

192.168.0.17 oracle1

192.168.0.17 oracle1.ekingstar

192.168.0.18 oracle2

192.168.0.18 oracle2.ekingstar

192.168.0.21 oracle1-vip

192.168.0.21 oracle1-vip.ekingstar

192.168.0.22 oracle2-vip

192.168.0.22 oracle2-vip.ekingstar

可能是集群负载均衡过程中返回的是域名吧，本地需要设置好域名对应的IP。