This type of session database stores no session details and always permits multiple logins. It is useful in environments with large user populations, and where no simultaneous-use prevention is required. <SessionDatabase NULL> uses much less memory and fewer CPU cycles than <SessionDatabase INTERNAL> (which is the default session database). The code for <SessionDatabase NULL> was contributed by Daniel Senie (dts@senie.com).

<SessionDatabase NULL> understands also the same parameters as <SessionDatabase xxxxxx>. For more information, see Section 3.17. <SessionDatabase xxxxxx>.