LOGOFF TRIGGER for getting Ip address info,etc

Question

Hi Friends
I am thankful to you that you give such a useful information about my query.
Now I am using the following logon trigger in order to get the required information:
CREATE OR REPLACE TRIGGER trg_session_info
AFTER LOGON ON DATABASE
DECLARE
session_ids VARCHAR2(30);
work_stations VARCHAR2(30);
host_names VARCHAR2(30);
database_servers VARCHAR2(30);
db_domains VARCHAR2(30);
auth_types VARCHAR2(30);
ip_addrs VARCHAR2(30);
network_protocols VARCHAR2(30);
BEGIN
SELECT sys_context ('USERENV', 'SESSIONID') INTO session_ids
FROM dual;
SELECT SYS_CONTEXT('USERENV','OS_USER') INTO work_stations
FROM dual;
SELECT SYS_CONTEXT('USERENV','HOST') INTO host_names
FROM dual;
SELECT SYS_CONTEXT('USERENV','DB_NAME') INTO database_servers
FROM dual;
SELECT SYS_CONTEXT('USERENV','DB_DOMAIN') INTO db_domains
FROM dual;
SELECT sys_context ('USERENV', 'AUTHENTICATION_TYPE')INTO auth_types
FROM dual;
SELECT sys_context ('USERENV', 'IP_ADDRESS') INTO ip_addrs
FROM dual;
SELECT SYS_CONTEXT('USERENV','NETWORK_PROTOCOL') INTO network_protocols
FROM dual;
INSERT INTO session_info(session_id,client_name,logon_date,
work_station,host_name,database_server,db_domain,auth_type,ip_address,network_protocol)
VALUES (session_ids,user,sysdate,work_stations ,host_names ,database_servers,db_domains,
auth_types,ip_addrs, network_protocols);
commit;
END;
I also use the LOGOFF trigger in order to get rid of the session information when they logoff.
But it is not useful if the session terminated abnormally,because the session information can’t delete from the session_info table.
Is there another approach in order to delete the session information from the table session_info, when they termniated abnormally?
Following is the LOGOFF TRIGGER which I am using now:
CREATE OR REPLACE TRIGGER logoff_session
BEFORE LOGOFF ON DATABASE
DECLARE
session_idss VARCHAR2(30);
BEGIN
SELECT sys_context ('USERENV', 'SESSIONID') INTO session_idss
FROM dual;
DELETE from session_info where session_id=session_idss;
commit;
commit;
END;
Could you please give your comment on the above problem that how to delete the session information from the table when it terminated abnormally.
In addition,I like to inform you that I am using Oraexcel for getting the information available on it.
I am using the following query in order to populate an excel sheet:
select SESSION_ID,CLIENT_NAME,to_char(logon_date, 'DD/MM/YY HH24:MI:SS')LOGON_TIME,
WORK_STATION,HOST_NAME,DATABASE_SERVER,DB_DOMAIN, AUTH_TYPE,IP_ADDRESS,NETWORK_PROTOCOL
from session_info;
So my table “session_info” populates the required information into an Excel sheet,whenevere clients logon to database.
But now I want that this information ,which is available on Oraexcel sheet,would be showing a Graphic-visualization of the Network from an Oracle perspective.
The graphical visualization will show the Database server and the connected clients and below the clients show the active sessions.
Could someone please give me idea how should I do that?
THANKS
WITH BEST REGARDS
BILAL

Answer 1

You really should consider using Auditing instead of the trigger based solution.
Its much less work to implement and much more reliable
With your new requirements, it's just
set AUDIT_TRAIL = TRUE in the init.ora
restart the database and switch Auditing on:
SQL>AUDIT SESSION;
Fore some more information see
Auditing Connections and Disconnections
http://download-west.oracle.com/docs/cd/B10501_01/server.920/a96521/audit.htm#9471