tns error

ORA-12154 : "TNS:could not resolve  service name"

Cause : oracle Net Services cannot locate the connect descriptor specified in the  tnsnames.ora configuration .

>> verify the tnsnames.ora files exists and that accessible .
>>verify that tnsnames.ora file in the location by the TNS_ADMIN environment variable.

ORA-12198: "TNS: could not find  path to destination  "
ORA-12203: "TNS: unable to connect the destination "

>> verify that you have correctly enter the service name of the database that you  want to connect.
>> verify that service name address ADDRESS parameter in the connect descriptor of your  tnsname.ora file are correct .
>> verify that you tnsname.ora  file stored in the directory defined in the TNS_ADMIN environment Variable

Looking forward for your suggestions.. please feel free to write to me.. Your help would definitely help to improve our blog. Chetan Yadav

tnsnames.ora

sample tnsnames.ora

---------------------------------------------------------------------------------------------------

# tnsnames.ora Network Configuration File: C:\oracle\product\10.2.0\db_1\network\admin\tnsnames.ora

# Generated by Oracle configuration tools.

ORCL =

  (DESCRIPTION =

    (ADDRESS = (PROTOCOL = TCP)(HOST = xp)(PORT = 1521))

    (CONNECT_DATA =

      (SERVER = DEDICATED)

      (SERVICE_NAME = orcl)

    )

  )

EXTPROC_CONNECTION_DATA =

  (DESCRIPTION =

    (ADDRESS_LIST =

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))

    )

    (CONNECT_DATA =

      (SID = PLSExtProc)

      (PRESENTATION = RO)

    )

  )

---------------------------------------------------------------------------------------------------



here my DB name is "ORCL"
host is "XP"

The tnsnames.ora file is used to store the net services names. The deafault location is %ORACLE_HOME\network\admin on windows and $ORACLE_HOME/netwrok/admin/on UNIX.

any mistake is there or u wanna give any suggestion so please write to me ............

Configuring Network settings on Oracle VM

any mistake is there or u wanna give any suggestion so please write to me ............