LOG ON - LOG OFF Trigger for User

*********************************************************************************
create table
stats$user_log
(
user_id varchar2(30),
session_id number(8),
host varchar2(30),
last_program varchar2(48),
last_action varchar2(32),
last_module varchar2(32),
logon_day date,
logon_time varchar2(10),
logoff_day date,
logoff_time varchar2(10),
elapsed_minutes number(8)
)
;

*********************************************************************************

create or replace trigger
logon_audit_trigger
AFTER LOGON ON DATABASE
BEGIN
insert into stats$user_log values(
user,
sys_context('USERENV','SESSIONID'),
sys_context('USERENV','HOST'),
null,
null,
null,
sysdate,
to_char(sysdate, 'hh24:mi:ss'),
null,
null,
null
);
END;
/
*********************************************************************************
---------------Designing the logoff trigger--------------------------------------
*********************************************************************************
create or replace trigger
logoff_audit_trigger
BEFORE LOGOFF ON DATABASE
BEGIN
-- ***************************************************
-- Update the last action accessed
-- ***************************************************
update
stats$user_log
set
last_action = (select action from v$session where
sys_context('USERENV','SESSIONID') = audsid)
where
sys_context('USERENV','SESSIONID') = session_id;
--***************************************************
-- Update the last program accessed
-- ***************************************************
update
stats$user_log
set
last_program = (select program from v$session where
sys_context('USERENV','SESSIONID') = audsid)
where
sys_context('USERENV','SESSIONID') = session_id;
-- ***************************************************
-- Update the last module accessed
-- ***************************************************
update
stats$user_log
set
last_module = (select module from v$session where
sys_context('USERENV','SESSIONID') = audsid)
where
sys_context('USERENV','SESSIONID') = session_id;
-- ***************************************************
-- Update the logoff day
-- ***************************************************
update
stats$user_log
set
logoff_day = sysdate
where
sys_context('USERENV','SESSIONID') = session_id;
-- ***************************************************
-- Update the logoff time
-- ***************************************************
update
stats$user_log
set
logoff_time = to_char(sysdate, 'hh24:mi:ss')
where
sys_context('USERENV','SESSIONID') = session_id;
-- ***************************************************
-- Compute the elapsed minutes
-- ***************************************************
update
stats$user_log
set
elapsed_minutes =
round((logoff_day - logon_day)*1440)
where
sys_context('USERENV','SESSIONID') = session_id;
END;
/

*******Here is a script to track the activity of a specific user:*****************

CREATE OR REPLACE TRIGGER "LOGON_AUDIT_TRIGGER" AFTER
LOGON ON DATABASE
DECLARE
sess number(10);
prog varchar2(70);
BEGIN
IF sys_context('USERENV','BG_JOB_ID') is null and user = 'MYUSERNAME' THEN
sess := sys_context('USERENV','SESSIONID');
SELECT program INTO prog FROM v$session WHERE audsid = sess
and rownum<=1;
INSERT INTO stats$user_log VALUES (
user,sys_context('USERENV','SESSIONID'),
sys_context('USERENV','HOST'),
prog,
sysdate,
sys_context('USERENV','OS_USER'));
END IF;
END;
/