Saturday, January 13, 2007

Oracle User Logon Trigger

It can be useful to set session settings for a user in a logon trigger. A user may want to override the setting for a specific parameter such as star_transformation_enabled, or it may be necessary to turn on sql_trace for a user.

create or replace trigger logontrigger after logon on schema
p_session_user varchar2(30);
p_host varchar2(200);
p_sql varchar2(230);
p_ip_address varchar2(30);
p_sessionid number(30);
select translate(sys_context('userenv', 'host'), '-\ /', '____') into p_host from dual;
select sys_context('userenv', 'session_user') into p_session_user from dual;
select sys_context('userenv', 'sessionid') into p_sessionid from dual;
select sys_context('userenv', 'ip_address') into p_ip_address from dual;

-- Create trace file with a recognizable name.
p_sql:='alter session set tracefile_identifier=' || p_session_user || '_' || p_host;
execute immediate p_sql;

-- Choose one of the following trace levels. The second form provides bind variables and the result set.
p_sql:='alter session set sql_trace=true';
--select 'alter session set events ' || '''10046 trace name context forever, level 12''' into p_sql from dual;
execute immediate p_sql;


show err
prompt Remember the user needs 'alter session' privilege.
prompt To remove: drop trigger logontrigger
After creating the logon trigger, log on as the user. If it does not generate a file in the user jump destination, then check the alert.log for errors.

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