linux下oracle登录问题，急，请高手指教
这是我的登录情况
[oracle@IC   oracle]$   sqlplus   "/as   sysdba "

SQL*Plus:   Release   9.0.1.0.0   -   Production   on   Tue   Apr   3   11:35:39   2007

(c)   Copyright   2001   Oracle   Corporation.     All   rights   reserved.

Connected   to   an   idle   instance.

SQL>   startup
ORACLE   instance   started.

Total   System   Global   Area     336356520   bytes
Fixed   Size                                       279720   bytes
Variable   Size                           268435456   bytes
Database   Buffers                       67108864   bytes
Redo   Buffers                                   532480   bytes
Database   mounted.
Database   opened.
SQL>   exit
Disconnected   from   Oracle9i   Enterprise   Edition   Release   9.0.1.0.0   -   Production
With   the   Partitioning   option
JServer   Release   9.0.1.0.0   -   Production
[oracle@IC   oracle]$   lsnrctl

LSNRCTL   for   Linux:   Version   9.0.1.0.0   -   Production   on   03-APR-2007   11:36:16

Copyright   (c)   1991,   2001,   Oracle   Corporation.     All   rights   reserved.

Welcome   to   LSNRCTL,   type   "help "   for   information.

LSNRCTL>   start
Starting   /home/oracle/product/9.0.1/bin/tnslsnr:   please   wait...

TNSLSNR   for   Linux:   Version   9.0.1.0.0   -   Production
System   parameter   file   is   /home/oracle/product/9.0.1/network/admin/listener.ora
Log   messages   written   to   /home/oracle/product/9.0.1/network/log/listener.log
Listening   on:   (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC)))
Listening   on:   (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=IC)(PORT=1521)))

Connecting   to   (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC)))
STATUS   of   the   LISTENER
------------------------
Alias                                           LISTENER
Version                                       TNSLSNR   for   Linux:   Version   9.0.1.0.0   -   Production
Start   Date                                 03-APR-2007   11:36:20
Uptime                                         0   days   0   hr.   0   min.   0   sec
Trace   Level                           &nb