Unable to resolve ORA-12154: TNS:could not resolve the connect identifier specified

Question

Hi Friends,
I am unable to resolve ORA-12154: TNS:could not resolve the connect identifier specified, error:
C:\Windows\system32>sqlplus scott/tiger@ORADATA
SQL*Plus: Release 11.2.0.1.0 Production on Sun Feb 2 13:46:10 2014
Copyright (c) 1982, 2010, Oracle.  All rights reserved.
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
SQL> select database_name from v$database;
DATABASE_NAME
ORADATA
SQL> select instance_name from v$instance;
INSTANCE_NAME
oradata
tnsnames.ora
============
ORADATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL=TCP)(HOST=himanshu-PC)(PORT=1521))
    (CONNECT_DATA =
(SERVICE_NAME = oradata)
  (SERVER = DEDICATED)
listener.ora
=========
LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = himanshu-PC)(PORT = 1521))
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (GLOBAL_DBNAME = ORADATA)
      (ORACLE_HOME = G:\app\himanshu\product\11.2.0\dbhome_1)
      (SID_NAME = oradata)
sqlnet.ora
========
SQLNET.AUTHENTICATION_SERVICES = (NTS)
C:\Windows\system32>lsnrctl status
LSNRCTL for 32-bit Windows: Version 11.2.0.1.0 - Production on 02-FEB-2014 13:53:37
Copyright (c) 1991, 2010, Oracle.  All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=himanshu-PC)(PORT=1521)))
STATUS of the LISTENER
Alias                     LISTENER
Version                   TNSLSNR for 32-bit Windows: Version 11.2.0.1.0 - Production
Start Date                02-FEB-2014 13:29:35
Uptime                    0 days 0 hr. 24 min. 6 sec
Trace Level               off
Security                  ON: Local OS Authentication
SNMP                      OFF
Listener Parameter File   G:\app\himanshu\product\11.2.0\dbhome_1\network\admin\listener.ora
Listener Log File         g:\app\himanshu\diag\tnslsnr\himanshu-PC\listener\alert\log.xml
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=himanshu-PC)(PORT=1521)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(PIPENAME=\\.\pipe\EXTPROC1521ipc)))
Services Summary...
Service "ORADATA" has 2 instance(s).
  Instance "ORADATA", status UNKNOWN, has 1 handler(s) for this service...
  Instance "oradata", status READY, has 1 handler(s) for this service...
Service "ORADATAXDB" has 1 instance(s).
  Instance "oradata", status READY, has 1 handler(s) for this service...
The command completed successfully
Kindly guide whats wrong with my configuration.

Answer 1

ORADATA =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL=TCP)(HOST=himanshu-PC)(PORT=1521))
    (CONNECT_DATA =
(SERVICE_NAME = oradata)
  (SERVER = DEDICATED)
Try editing the tnsnames.ora file to check there is any junk characters around the tns entry(shown in RED) and then try pining the tns from CMD as
tnsping ORADATA.