Prior to Athene version 10.20, Acquire for UNIX/Linux always used the OS-level
authentication method to access a local Oracle database. This uses the “bequeath”
protocol which has the following properties:
Does not use a network Listener (therefore, no Listener configuration is required).
Automatically spawns a dedicated server
No user name and password is required to access the database.
Is used for local connections where an Oracle database client application, such as SQL*Plus, communicates with an Oracle database instance running on the same computer.
Only works in dedicated server mode – it cannot be used in a shared server mode.