11g DATABASE BACK UP

Question

Hi,
I am trying to do back up of one of my oracle 11g db out of 2 through rman utility. Am doing the following steps.
[http://www.youtube.com/watch?v=8dA6BYxF_YE]
But i am getting the following error messages :
Directory of c:\app\Manaar1\oradata\orclDW
:\app\Manaar1\oradata\orclDW>set ORACLE_SID=rman
c:\app\Manaar1\oradata\orclDW>set ORACLE_SID=oradata
c:\app\Manaar1\oradata\orclDW>set ORACLE_SID=rman
c:\app\Manaar1\oradata\orclDW>set ORACLE_SID=oradata
c:\app\Manaar1\oradata\orclDW>echo %ORACLE_SID%
oradata
c:\app\Manaar1\oradata\orclDW>rman target/
Recovery Manager: Release 11.2.0.3.0 - Production on Wed Feb 8 00:50:23 2012
Copyright (c) 1982, 2011, Oracle and/or its affiliates. All rights reserved.
RMAN-00571: ===========================================================
RMAN-00569: =============== ERROR MESSAGE STACK FOLLOWS ===============
RMAN-00571: ===========================================================
RMAN-00554: initialization of internal recovery manager package failed
RMAN-04005: error from target database:
ORA-12560: TNS:protocol adapter error
does this means my rman utility is working properly or that my database path is not accurate..bcz that is the correct database path i entered.

Answer 1

I did as you said for sqlplus but its showing in the end tns eror message
Microsoft Windows [Version 6.1.7600]
Copyright (c) 2009 Microsoft Corporation. All rights reserved.
C:\Users\windowsaleem>sqlplus/user
SQL*Plus: Release 11.2.0.3.0 Production on Wed Feb 8 04:39:22 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
SQL*Plus: Release 11.2.0.3.0 Production
Copyright (c) 1982, 2011, Oracle. All rights reserved.
Use SQL*Plus to execute SQL, PL/SQL and SQL*Plus statements.
Usage 1: sqlplus -H | -V
-H Displays the SQL*Plus version and the
usage help.
-V Displays the SQL*Plus version.
Usage 2: sqlplus [ [<option>] [{logon | /nolog}] [<start>] ]
<option> is: [-C <version>] [-L] [-M "<options>"] [-R <level>] [-S]
-C <version> Sets the compatibility of affected commands to the
version specified by <version>. The version has
the form "x.y[.z]". For example, -C 10.2.0
-L Attempts to log on just once, instead of
reprompting on error.
-M "<options>" Sets automatic HTML markup of output. The options
have the form:
HTML ON [HEAD text] [BODY text] [TABLE text]
[ENTMAP {ON|OFF}] [SPOOL {ON|OFF}] [PRE[FORMAT] ON]
-R <level> Sets restricted mode to disable SQL*Plus commands
that interact with the file system. The level can
be 1, 2 or 3. The most restrictive is -R 3 which
disables all user commands interacting with the
file system.
-S Sets silent mode which suppresses the display of
the SQL*Plus banner, prompts, and echoing of
commands.
<logon> is: {<username>[<password>][@<connect_identifier>] | / }
[AS {SYSDBA | SYSOPER | SYSASM}] [EDITION=value]
Specifies the database account username, password and connect
identifier for the database connection. Without a connect
identifier, SQL*Plus connects to the default database.
The AS SYSDBA, AS SYSOPER and AS SYSASM options are database
administration privileges.
<connect_identifier> can be in the form of Net Service Name
or Easy Connect.
@[<net_service_name> | [/]Host[:Port]/<service_name>]
<net_service_name> is a simple name for a service that resolves
to a connect descriptor.
Example: Connect to database using Net Service Name and the
database net service name is ORCL.
sqlplus myusername/mypassword@ORCL
Host specifies the host name or IP address of the database
server computer.
Port specifies the listening port on the database server.
<service_name> specifies the service name of the database you
want to access.
Example: Connect to database using Easy Connect and the
Service name is ORCL.
sqlplus myusername/mypassword@Host/ORCL
The /NOLOG option starts SQL*Plus without connecting to a
database.
The EDITION specifies the value for Session Edition.
<start> is: @<URL>|<filename>[.<ext>] [<parameter> ...]
Runs the specified SQL*Plus script from a web server (URL) or the
local file system (filename.ext) with specified parameters that
will be assigned to substitution variables in the script.
When SQL*Plus starts, and after CONNECT commands, the site profile
(e.g. $ORACLE_HOME/sqlplus/admin/glogin.sql) and the user profile
(e.g. login.sql in the working directory) are run. The files may
contain SQL*Plus commands.
Refer to the SQL*Plus User's Guide and Reference for more information.
C:\Users\windowsaleem>sqlplus user/pass
SQL*Plus: Release 11.2.0.3.0 Production on Wed Feb 8 04:42:11 2012
Copyright (c) 1982, 2011, Oracle. All rights reserved.
ERROR:
ORA-12560: TNS:protocol adapter error
Enter user-name: [oracle@test oracle]$ rman target /RMAN> backup database;
SP2-0306: Invalid option.
Usage: CONN[ECT] [logon [AS {SYSDBA|SYSOPER|SYSASM}] [edition=value]]
where <logon> ::= <username>[<password>][@<connect_identifier>]
<proxy> ::= <proxyuser>[<username>][<password>][@<connect_identifier>]
Enter user-name: {oracle@test oracle }$ rman target /RMAN> back