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Database Access 2.1c on a UNIX client workstation provides Direct Connect functionality to access an Oracle instance only. The Database Access 2.1c direct connect drivers for Oracle are only supported on Oracle instances running release 8.1.2 or higher. Oracle 8.0.x releases are not supported.
Database access applications function the same whether using an ArcSDE 8.1.2 or lower version, service, or database instance via Direct Connect.
To use direct connect, you must have the Oracle Net8 Client installed on your UNIX workstation. Direct connect is managed through the Oracle Net8 client.
The Net Service Name must be configured in order to connect to the server.
To test that your Oracle setup is correct you can use SQL connect feature of ArcView, or the Avenue connection syntax:
Details for Net Service install are in the ArcSDE Configuration and Tuning Guide for Oracle, located in the $AVHOME\AvDocs directory after you complete your ArcView install.