Tnsping

Question

Hi All,
I am not able to connect to sqlplus . It is showing ORA-12154: TNS: could not resolve the connect identifier specifed. I could not tnsping orcl either(TNS-03505: Failed to resolve name).Environment variable ORACLE_HOME:C:\app\oracle\product\11.2.0\dbhome_2
PATH:C:\app\oracle\product\11.2.0\dbhome_2\bin;
TNS_NAME:C:\app\oracle\product\11.2.0\dbhome_2\network\admin
tnsname.ora file:
LISTENER_ORCL =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
ORACLR_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1521))
(CONNECT_DATA =
(SID = CLRExtProc)
(PRESENTATION = RO)
ORCL =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
(CONNECT_DATA =
(SERVER = DEDICATED)
(SERVICE_NAME = orcl)
listner.ora file:
SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = CLRExtProc)
(ORACLE_HOME = C:\app\oracle\product\11.2.0\dbhome_2)
(PROGRAM = extproc)
(ENVS = "EXTPROC_DLLS=ONLY:C:\app\oracle\product\11.2.0\dbhome_2\bin\oraclr11.dll")
(SID_DESC =
(GLOBAL_DBNAME = orcl)
(SID_NAME = orcl)
(ORACLE_HOME = C:\app\oracle\product\11.2.0\dbhome_2)
sqlnet file:
SQLNET.AUTHENTICATION_SERVICES= (NTS)
NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)
Thanks,
Surya

Answer 1

user3939966 wrote:
Hi All,
I am not able to connect to sqlplus . It is showing ORA-12154: TNS: could not resolve the connect identifier specifed. ORA-12154 ALWAYS only occurs on SQL Client & no SQL*Net packets ever leave client system
ORA-12154 NEVER involves the listener, the database itself or anything on the DB Server.
ORA-12154 occurs when client requests a connection to some DB server system using some connection string.
The lookup operation fails because the name provided can NOT be resolved to any remote DB.
The analogous operation would be when you wanted to call somebody, but could not find their name in any phonebook.
The most frequent cause for the ORA-12154 error is when the connection alias can not be found in tnsnames.ora.
The lookup operation of the alias can be impacted by the contents of the sqlnet.ora file; specifically DOMAIN entry.
TROUBLESHOOTING GUIDE: ORA-12154 & TNS-12154 TNS:could not resolve service name [ID 114085.1]
http://edstevensdba.wordpress.com/2011/02/26/ora-12154tns-03505/