MO_GLOBAL.SET_ORG_ACCESS being pragma autonomous trxn

Question

Hi,
I was going through the package body of MO_GLOBAL. I could understand how SET_POLICY_CONTEXT, INIT, etc etc works and the way they set the g_access_mode, g_current_org_id etc etc .But my question is on MO_GLOBAL.SET_ORG_ACCESS which is used to set the access mode to M.
Seems MO_GLOBAL.SET_ORG_ACCESS is pragma autonomous Transaction. So how is it paossible for MO_GLOBAL.SET_ORG_ACCESS to set the acess mode etc of the session from which it is called from? However the other procedures in the package viz SET_POLICY_CONTEXT, INIT etc are not Pragma Autonomous Trxn.
My question is...... suppose, I am logged into an Oracle session and from there I execute MO_GLOBAL.SET_ORG_ACCESS(null,2062, 'AR'); MO_GLOBAL.SET_ORG_ACCESS being pragma autonomous transaction how can it set the session variables for the session from which I am logged in?
Please through some light to make my understanding better.
QN:- When a procedure/function/session calls a Autonomous trxn procedure, will both the calling and called blocks share the same session? I was thinking both have different sessions.
Thanks

Answer 1

Autonomous transaction clause will initiate an independent transaction , not new session as per below test case.
DECLARE
PROCEDURE A
AS
pragma autonomous_transaction;
BEGIN
dbms_output.put_line ( 'Inside Autonomous transaction My session id ' || sys_context ( 'USERENV' , 'SID' ) ) ;
ROLLBACK;
END ;
BEGIN
dbms_output.put_line ( 'My session id ' || sys_context ( 'USERENV' , 'SID' ) ) ;
a;
dbms_output.put_line ( 'Outside Autonomous transaction My session id ' || sys_context ( 'USERENV' , 'SID' ) ) ;
END;
OUTPUT :
My session id 531
Inside Autonomous transaction My session id 531
Outside Autonomous transaction My session id 531