ora-12514:TNS:listener does not currently know of service requested in connect descriptor

问题所在---监听目前不知道要求服务连接描述符

这个错误可能是因为Listener出了问题，检查listener.ora文件，我的文件在/home/oracle/oracle/product/10.2.0/db_1/network/admin/目录下,

如下配置：

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /home/oracle/oracle/product/10.2.0/db_1/)
      (PROGRAM = extproc)
    )
)
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
    )
  )

则要在(SID_LIST = ...)里添加我们自己的实例, 将localhost改成安装oracle的机器的IP地址, 我的是loracle:

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
  (SID_NAME = PLSExtProc)
  (ORACLE_HOME = /home/oracle/oracle/product/10.2.0/db_1/)
  (PROGRAM = extproc)
  ) (SID_DESC =
     (SID_NAME = loracle)
     (ORACLE_HOME = /home/oracle/oracle/product/10.2.0/db_1/)
 (GLOBAL_DBNAME = loracle)
  )
)
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.101)(PORT = 1521))
    )
)

保存, 重启监听

[oracle@localhost bin]$ lsnrctl stop
[oracle@localhost bin]$ lsnrctl start