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ORA-12154: TNS:could not resolve the connect identifier specified [message #515252]

Sat, 09 July 2011 07:48

9390512774
Messages: 103
Registered: January 2011
Location: hyd

Senior Member

I installed oracle 10gr2 in OEL5.5 in VMWare.
the following is the entry in TNSNAMES.ORA file

    # tnsnames.ora Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/tnsnames.ora
    # Generated by Oracle configuration tools.

    TSH1 =
      (DESCRIPTION =
        (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
        (CONNECT_DATA =
          (SERVER = DEDICATED)
          (SERVICE_NAME = TSH1)
        )
      )

    EXTPROC_CONNECTION_DATA =
      (DESCRIPTION =
        (ADDRESS_LIST =
          (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
        )
        (CONNECT_DATA =
          (SID = PLSExtProc)
          (PRESENTATION = RO)
        )
      )

When i am trying to connect to this DATABASE through my PL/SQL DEVELOPER which is installed in WINDOWS. It's gave the error ORA-12154.
Please provide solution .

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Re: ORA-12154: TNS:could not resolve the connect identifier specified [message #515253 is a reply to message #515252]

Sat, 09 July 2011 08:00

Its_me_ved
Messages: 979
Registered: October 2009
Location: India

Senior Member

Quote:

ORA-12154:TNS:could not resolve the connect identifier specified
Cause: A connection to a database or other service was requested using a connect identifier, and the connect identifier specified could not be resolved into a connect descriptor using one of the naming methods configured. For example, if the type of connect identifier used was a net service name then the net service name could not be found in a naming method repository, or the repository could not be located or reached.
Action:

- If you are using local naming (TNSNAMES.ORA file):

- Make sure that "TNSNAMES" is listed as one of the values of the NAMES.DIRECTORY_PATH parameter in the Oracle Net profile (SQLNET.ORA)

- Verify that a TNSNAMES.ORA file exists and is in the proper directory and is accessible.

- Check that the net service name used as the connect identifier exists in the TNSNAMES.ORA file.

- Make sure there are no syntax errors anywhere in the TNSNAMES.ORA file. Look for unmatched parentheses or stray characters. Errors in a TNSNAMES.ORA file may make it unusable.

- If you are using directory naming:

- Verify that "LDAP" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).

- Verify that the LDAP directory server is up and that it is accessible.

- Verify that the net service name or database name used as the connect identifier is configured in the directory.

- Verify that the default context being used is correct by specifying a fully qualified net service name or a full LDAP DN as the connect identifier

- If you are using easy connect naming:

- Verify that "EZCONNECT" is listed as one of the values of the NAMES.DIRETORY_PATH parameter in the Oracle Net profile (SQLNET.ORA).

- Make sure the host, port and service name specified are correct.

- Try enclosing the connect identifier in quote marks. See the Oracle Net Services Administrators Guide or the Oracle operating system specific guide for more information on naming.

Regards
Ved

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Re: ORA-12154: TNS:could not resolve the connect identifier specified [message #515256 is a reply to message #515253]

Sat, 09 July 2011 08:13

9390512774
Messages: 103
Registered: January 2011
Location: hyd

Senior Member

Thanks Ved for your quick response.

I didn't installed any client versions of oracle in local sytem(windows).
I have only pl/sql developer tool installed.
Here I am providing the sqlnet.ora file and listener.ora files.
SQLNET.ORA file is

# sqlnet.ora Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/sqlnet.ora
# Generated by Oracle configuration tools.

NAMES.DIRECTORY_PATH= (TNSNAMES, EZCONNECT)

listener.ora file is:

# listener.ora Network Configuration File: /u01/app/oracle/product/10.2.0/db_1/network/admin/listener.ora
# Generated by Oracle configuration tools.

SID_LIST_LISTENER =
  (SID_LIST =
    (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = /u01/app/oracle/product/10.2.0/db_1)
      (PROGRAM = extproc)
    )
  )

LISTENER =
  (DESCRIPTION_LIST =
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC1))
      (ADDRESS = (PROTOCOL = TCP)(HOST = localhost.localdomain)(PORT = 1521))
    )
  )

Please tell me what connection identifier i have to provide. to resolve the error.
And any modification need in these files.
If i am connecting with putty i am able to work on database.but for other tools its gave the error.
Thanks in Advance.

[Updated on: Sat, 09 July 2011 08:15]

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Re: ORA-12154: TNS:could not resolve the connect identifier specified [message #515258 is a reply to message #515256]

Sat, 09 July 2011 08:54

BlackSwan
Messages: 26766
Registered: January 2009
Location: SoCal

Senior Member

sqlplus scott/tiger@TSH1

COPY command & results from above then PASTE all back here

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Re: ORA-12154: TNS:could not resolve the connect identifier specified [message #515260 is a reply to message #515258]

Sat, 09 July 2011 09:58

luc_tran
Messages: 31
Registered: October 2010
Location: Viet Nam

Member

If I remember it right (have not been used PL/SQL Developer for a long time), PL/SQL Developer requires Oracle client installed on the same machine. So you should install Oracle client and configure tnsnames.ora in order to make it work. If you don't want to install Oracle client, try using Oracle SQL Developer instead of PL/SQL Developer.

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