1、下载免安装的客户端，解压到E:softinstantclient_11_2，解压后修改E:softinstantclient_11_2 etworkadmin目录下的tnsnames.ora文件
数据库名=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = IP地址)(PORT = 端口))
)
(CONNECT_DATA =
(SERVICE_NAME = servicem)
)
)
2、进入plsql，点击tools=>preferences
oracle home:E:softinstantclient_11_2
oci library:E:softinstantclient_11_2oci.dll
3、从新进入plsql即可登录
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记录下自己的安装过程，以便于后期自己再次安装方便
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