oracle10g客户端连接oracle9i数据库

oracle10g客户端连接oracle9i数据库，Net Manager配置

概要文件：命名方法选择：TNSNAMES

服务命名：创建-下一步到第4页，选择（oracle8或更低版本）SID，输入数据库名比如ecoradb

oracle9i数据库，为什么要选择这个呢，说不通啊，可事实上就是选择这个，如果不选择这个，pl/sql 连接数据库的时候会报 ORA-12154: TNS: 无法解析指定的连接标识符 的错误）

原来tnsnames.ora 的格式如下

12.2.26.123 =   
  (DESCRIPTION =   
    (ADDRESS_LIST =   
      (ADDRESS = (PROTOCOL = TCP)(HOST = 12.2.26.123)(PORT = 1521))   
    )   
    (CONNECT_DATA =   
      (SERVICE_NAME= ecoradb)   
    )   
  )

最后tnsnames.ora 的格式如下：

12.2.26.123 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 12.2.26.123)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = ecoradb)
    )
  )

 区别仅仅在于service_name 改成了sid

完整配置参考如下：

# tnsnames.ora Network Configuration File: D:\oracle\product\10.2.0\client_1\NETWORK\ADMIN\tnsnames.ora
# Generated by Oracle configuration tools.

12.2.26.123 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 12.2.26.123)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = ecoradb)
    )
  )

ECORADB =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 12.2.26.123)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SID = ecoradb)
    )
  )