* The choice of threading model is dictated by the THREADED_EXECUTION initialization parameter. THREADED_EXECUTION=FALSE: The default value causes Oracle to run using the multiprocess model. THREADED_EXECUTION=TRUE: Oracle runs with the multithreaded model. *OS Authentication is not supported with the multithreaded model. * THREADED_EXECUTION When this initialization parameter is set to TRUE, which enables the multithreaded Oracle model, operating system authentication is not supported. Attempts to connect to the database using operating system authentication (for example, CONNECT / AS SYSDBA or CONNECT / ) when this initialization parameter is set to TRUE receive an ORA-01031"insufficient privileges" error.