oracle tnsnames.ora 配置实例问题

ORCL =
  (DESCRIPTION =
    (ADDRESS = (PROTOCOL = TCP)(HOST = localhost )(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
    )

  )

如果orcl 前面有空格在 pl/sql选取的时候,就会有 “无法解析指定的连接标示符”