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How to connect oracle db by OracleConnection? [message #282679] Fri, 23 November 2007 00:08 Go to next message
chudq
Messages: 4
Registered: November 2007
Junior Member
I downloaded and installed Oracle 10g XE and Oracle ODAC. I tried to make a connection to my Oracle db HR database by OracleConnection in .Net C#. I got an error message of "ORA-12154: TNS:could not resolve the connect identifier specified".

My connection string is "User Id={0};Password={1};Data Source={2};", where {0} is HR, {1} is the pwd, and {2} is "XE". I think the Data Source is not correct. How can I find the correct one? Or something else wrong? Thanks for any help!

[Updated on: Fri, 23 November 2007 00:09]

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Re: How to connect oracle db by OracleConnection? [message #287857 is a reply to message #282679] Thu, 13 December 2007 17:01 Go to previous messageGo to next message
0551373
Messages: 6
Registered: December 2007
Junior Member
Before we answer the question, please answer the following, is the workstation configure to connect to the server. is the net service configure propertly? second is the Listener, the only listener available and is it up?

Re: How to connect oracle db by OracleConnection? [message #287859 is a reply to message #282679] Thu, 13 December 2007 17:09 Go to previous messageGo to next message
BlackSwan
Messages: 25036
Registered: January 2009
Location: SoCal
Senior Member
0551373,
I doubt that chudq has been waiting patiently for THREE weeks for your 1st post & I would be surprised if (s)he could answer your questions.

Welcome Aboard!

[Updated on: Thu, 13 December 2007 17:09] by Moderator

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Re: How to connect oracle db by OracleConnection? [message #287900 is a reply to message #282679] Fri, 14 December 2007 00:36 Go to previous message
Michel Cadot
Messages: 64103
Registered: March 2007
Location: Nanterre, France, http://...
Senior Member
Account Moderator
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
Michel
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