Wednesday, 3 June 2020

How to Use Logon Trigger to trace sessions connected to Oracle database?

To start tracing:

create or replace trigger user_logon_trg
after logon on database
begin
if USER = 'xxxx' then
execute immediate
'Alter session set events ''10046 trace name context forever, level 8''';
end if;
end;
/

/* Login a new session as User 'xxxx' and execute your selects to be traced */


NOTE: The following syntax can also be used within the if logic to also get the user name or to add more granularity by specifying a host name where the connection originated.

IF SYS_CONTEXT('USERENV','SESSION_USER') = '<USER_NM>' AND SYS_CONTEXT('USERENV','HOST') = '<HOST_NM>' THEN

To stop tracing: via LogOff Trigger (needs to be created before logging off)

create or replace trigger user_logoff_trg
before logoff on database
begin
if USER = 'xxxx' then
execute immediate
'Alter session set events ''10046 trace name context off''';
end if;
end;
/


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