Unfortnuately, some people don't log out from DLP properly. They simply close their browser and go on their merry way leaving behind an open entry in the USER SESSION table. As such the query is constrained to those who have logged in within the last 2 days, 48 hours before the point int time that the query is run (see the "sysdate-2"). To change this, simply replace the 2 with however many days in the past you wish to include.
To use, log into SQLPlus as protect (or the DLP schema owner), and type the following:
set pagesize 100
column logged_on format a24
column userid format 99999999
column username format a30
select Distinct u.userid userid,
from usersession u,
where u.logofftime is NULL
and u.logontime >(sysdate-2)
and u.userid = pu.userid
group by u.userid, pu.name;
The "distinct" clause is used incase a user logged in withotu logging out multiple times during the time period.
The userid of 1 is excluded as this is the "Adminstrator" account.
The script simply displays a list of who has logged in, but has not logged out.