This parameter specifies whether a trusted client is authenticated at the server or the client when the client provides a userid and password combination for a connection. This parameter (and trust_allclnts) is only active if the authentication parameter is set to CLIENT. If a user ID and password are not provided, the client is assumed to have validated the user, and no further validation is performed at the server.
If this parameter is set to "CLIENT" (the default), the trusted client can connect without providing a userid and password combination, and the assumption is that the operating system has already authenticated the user. If it is set to "SERVER", the user ID and password will be validated at the server.
The numeric value for CLIENT is 0. The numeric value for SERVER is 1.