PL/SQL 连接oracle数据库老报ora-12541：TNS:无监听程序

今天用PL/SQL连接某数据库老报ora-12541：TNS:无监听程序 错。

解决办法：

Refer to the SQL*Plus User's Guide and Reference for more information.

[oracle@vserever75 ~]$ sqlplus /nolog

SQL*Plus: Release 10.2.0.4.0 - Production on Thu Apr 25 10:28:11 2013

Copyright (c) 1982, 2007, Oracle.  All Rights Reserved.

SQL> conn / as sysdba

Connected to an idle instance.

SQL> startup

ORACLE instance started.

Total System Global Area 2147483648 bytes

Fixed Size                  2085320 bytes

Variable Size            1308626488 bytes

Database Buffers          822083584 bytes

Redo Buffers               14688256 bytes

Database mounted.

Database opened.

SQL> quit

Disconnected from Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bit Production

With the Partitioning, OLAP, Data Mining and Real Application Testing options

[oracle@vserever75 ~]$ lsnrctl start

LSNRCTL for Linux: Version 10.2.0.4.0 - Production on 25-APR-2013 10:29:35

Copyright (c) 1991, 2007, Oracle.  All rights reserved.

Starting /oracle/app/db/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 10.2.0.4.0 - Production

System parameter file is /oracle/app/db/network/admin/listener.ora

Log messages written to /oracle/app/db/network/log/listener.log

Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=XXX.XXX.3.75)(PORT=1521)))

Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))

Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=XXX.XXX.3.75)(PORT=1521)))

STATUS of the LISTENER

------------------------

Alias                     LISTENER

Version                   TNSLSNR for Linux: Version 10.2.0.4.0 - Production

Start Date                25-APR-2013 10:29:35

Uptime                    0 days 0 hr. 0 min. 0 sec

Trace Level               off

Security                  ON: Local OS Authentication

SNMP                      OFF

Listener Parameter File   /oracle/app/db/network/admin/listener.ora

Listener Log File         /oracle/app/db/network/log/listener.log

Listening Endpoints Summary...

  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=XXX.XXX.3.75)(PORT=1521)))

  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC0)))

Services Summary...

Service "PLSExtProc" has 1 instance(s).

  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...

Service "boss1" has 1 instance(s).

  Instance "boss1", status UNKNOWN, has 1 handler(s) for this service...

The command completed successfully

[oracle@vserever75 ~]$

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