E
Frequently asked questions

E.1 Frequently asked questions

This section contains the following frequently asked questions:

• "What are the OracleAS Discoverer settings configured on installation?"

• "What should I do if I get a network error?"

• "What do I need to do if I get ORA-12154 TNS: Could not resolve service name?"

Note: For FAQs about Discoverer security, see Section 12.9, "Frequently asked questions about security".

What are the OracleAS Discoverer settings configured on installation?

For more information about Discoverer system preferences, see Section A.6, "List of configuration settings in opmn.xml").

What should I do if I get a network error?

If OracleAS Discoverer receives a network exception during login, check the following:

• Are there any directories or jar files in the CLASSPATH or PATH that might interfere with OracleAS Discoverer? OracleAS Discoverer uses VisiBroker CORBA V4.5 and JDK 1.3.

• Make sure the VisiBroker SmartAgent and OAD are up and running and that a new session can be started.

• Make sure the Preferences component is up and running. To confirm that the Preferences component is up and running, use the Windows Task Manager and make sure that the Discoverer preferences command line utility dis51pr or dis51pre is running.

Hint: You can use the checkdiscoverer utility to verify a Discoverer configuration and report on failures or anomalies (for more information about the checkdiscoverer utility, see Section 4.11.2, "What is the checkdiscoverer utility?").

What do I need to do if I get ORA-12154 TNS: Could not resolve service name?

This is an Oracle error that appears when the session cannot connect to the database alias specified in the Connect field. Make sure that:

• the database alias is in the tnsnames.ora file

• the database alias exists in the tnsnames.ora file on every machine that runs sessions

Hint: If you have SQL*Plus (or any other Oracle product) running on that machine, try connecting to the database with that product.

Notes

• If you specify a database using the full tnsnames entry for the database (e.g. SID, address, port), you can connect databases that do not have an entry in the tnsnames.ora file. For example, you might enter the following string in the Database field:

  (DESCRIPTION =(ADDRESS_LIST =(ADDRESS = (PROTOCOL = TCP)(HOST = machine_a.company.com)(PORT = 1521)))(CONNECT_DATA =(SERVICE_NAME = database1)))

• For more information about the location of the tnsnames.ora file, see Section A.2, "List of Discoverer file locations".