How to connect oracle db by OracleConnection? [message #282679] |
Fri, 23 November 2007 00:08 |
chudq
Messages: 4 Registered: November 2007
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Junior Member |
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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] Report message to a 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 |
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Michel Cadot
Messages: 68707 Registered: March 2007 Location: Nanterre, France, http://...
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Senior Member Account Moderator |
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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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