ORA-12514: TNS:listener does not currently know of service

用PL\SQL打开oracle数据库时出现了这种错误：ORA-12514: TNS:listener does not currently know of service requested in connect descriptor。

解决方法如下：

在安装目录下: /home/oracle/oracle/product/10.2.0/db_1/network/admin/listener.ora
将：SID_LIST_LISTENER   =
    (SID_LIST   =
        (SID_DESC   =
            (SID_NAME   =   PLSExtProc)
            (ORACLE_HOME   =   E:\oracle\product\10.1.0\Db_1)
            (PROGRAM   =   extproc)
        )
    )

改为：
SID_LIST_LISTENER   =
    (SID_LIST   =
        (SID_DESC   =
            (SID_NAME   =   PLSExtProc)
            (ORACLE_HOME   =   E:\oracle\product\10.1.0\Db_1)
            (PROGRAM   =   extproc)
        )
        (SID_DESC   =
            (GOLBAL_DBNAME=   orcl)
            (ORACLE_HOME   =   E:\oracle\product\10.1.0\Db_1)
            (SID_NAME=orcl)
        )
    )

然后重启服务和监听以后，登陆正常。