plsql 更改，新增连接地址

\oracle\product\10.2.0\db_1\NETWORK\ADMIN

tnsnames.ora 文件中修改。

如：

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = x.x.x.x)(PORT = xxxx))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = ORAS)
    )
  )