Oracle Database Discussions

Microsoft Windows XP [Version 5.1.2600]
(C) Copyright 1985-2001 Microsoft Corp.

C:\Documents and Settings\Jon>sqlplus connect sysdba@LISTENER

SQL*Plus: Release 11.2.0.1.0 Production

Copyright (c) 1982, 2010, Oracle. All rights reserved.
C:\Documents and Settings\Jon>sqlplus /nolog

SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 20 20:33:35 2012

Copyright (c) 1982, 2010, Oracle. All rights reserved.

SQL> connect sysdba@listener
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified


SQL> exit

C:\Documents and Settings\Jon>set ORACLE_HOME=C:\app\Jon\product\11.2.0\dbhome_1


C:\Documents and Settings\Jon>ORACLE_HOME
'ORACLE_HOME' is not recognized as an internal or external command,
operable program or batch file.

C:\Documents and Settings\Jon>echo %ORACLE_HOME%
C:\app\Jon\product\11.2.0\dbhome_1

C:\Documents and Settings\Jon>sqlplus /nolog

SQL*Plus: Release 11.2.0.1.0 Production on Wed Jun 20 20:35:34 2012

Copyright (c) 1982, 2010, Oracle. All rights reserved.

SQL> connect sysdba@listener
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified


I have also noticed that trying to set new environment variables through My Computer, does not seem to retain the environment variable, maybe my operating system (Win SP SP3) has gone corrupt, or has a bug, but I don't have a confirmation as yet.