Monday, 16 July 2012

AOL-Multiple oraganizations Access control(MOAC)-R12--Part1

Here i am trying to put the MOAC techical architecture in simple terms..

we are might have heard the term multi organization till 11.5.10 prior it is only one organization

what does multiorganization mean??
Managing multiple organizations data in a single system...putting it in lay man terms
For example lets take GEfinancial
It is headquarted in US and operations in india also..assume it declares the Profit and loss results in both the countries..
Indian accounting rules, financial Calendar is different between the US and India..
since it belongs to same company with in one system I define two operating units one for us and one for India
different ledgers and calendars...if I want I can have different chart of accounts also..

to manage data for both the organizations with in single instance oracle introduced the column org_id in all table which holds organization specific data..

For data security purpose people of a organization should able to see their own data to achieve this
they created view on the base table like _all _B which restricts the data of the organization to which the user/user responsibility is attached.
for this purpose they defined a profile MO:operating unit which is set at the responsibility/user level
based on this value the system context org_id is set to the operating unitid set at the profile level
and a additional conditiion is added to the where clause of the views like

'org_id = substrb(userenv(''CLIENT_INFO''),1,10)'

By this way they are able to restrict data to the one organization in all the forms,reports,concprograms

fnd_global.apps_intialize--will set the applciation context org_id

thats the resason when ever we try to access the data from toad/sql plus for single org specific views we will not get any results..

select * from po_headers--no data found

if we set the application context we will able to see data for that org_id

execute dbms_Application_info.set_client_info('101');
fnd_global.apps_intialize(userid,responsibilityid,applicationid) --this inturn will get the org_id and set the context

From R12:Multiple organization access control

Till one responsibility is able to see data of only one operating unit..
when ever we want to see another operating unit data we need to change resposnsibility..
From R12 oracle introduced the concept of Multiple organization access control(MOAC) so that being in the same responsibility the user should
be able to see the data for which he is give access..
let see how they achieved it..

1.First we will define a policy which will have access for different operating units
2.they attach that policy to the responsibility/user at profile option level

technically..till 11.5.10 the query is getting chagned as org_id=101
if we have to access multiple organization it should changed to org_id in (101,102) or exits...

for achieving this oracle used the concept of Virtual Private Database (VPD)..
The Virtual Private Database (VPD) feature allows developers to enforce security by attaching a security policy to database objects such as tables, views and synonyms. It attaches a predicate function to every SQL statement to the objects by applying security policies. When a user directly or indirectly accesses the secure objects, the database rewrites the user's SQL statement to include conditions set by security policy that are visible to the user.

First lets decide whethere the access mode to a responsibility is single or multiple or all.Based on the security policy oracle decides the access mode
let assume our security policy which is attached to our respobility has access to the two operating units.
now oracle will populate the global temporary table(session controlled) mo_glob_org_access_tmp with all the operating units attached to the security policy
of yours..

based on the vpd a concept from oracle 9i onwards they defined a policy 'ORG_SEC' which call the function 'MO_GLOBAL.ORG_SECURITY' for all the objects to which the policy is attached..

MO_GLOBAL.Org_Security function:

FUNCTION org_security(obj_schema VARCHAR2
-- Returns different predicates based on the access_mode
-- The codes for access_mode are
-- M - Multiple OU Access
-- A - All OU Access
-- S - Single OU Access
-- Null - Backward Compatibility - CLIENT_INFO case
IF g_access_mode IS NOT NULL THEN
IF g_access_mode = 'M' THEN
FROM mo_glob_org_access_tmp oa
WHERE oa.organization_id = org_id)';
ELSIF g_access_mode = 'A' THEN -- for future use
ELSIF g_access_mode = 'S' THEN
RETURN 'org_id = sys_context(''multi_org2'',''current_org_id'')';
RETURN 'org_id = substrb(userenv(''CLIENT_INFO''),1,10)';
END org_security;

let see what happend po_headers view( in R12

1.Dropped the view po_headers
2.Created a synonym for the base table
create synnonym for po_headers for po_headers_all

3.attach the security policy org_sec to this synonym

so when ever we access this synonym from any where the policy will call the mo_global.org_Security funcion to all a condition to the select statement we isssued

select * from po_headers will be changed as

select * from po_headerS_all where exists 'EXISTS (SELECT 1
FROM mo_glob_org_access_tmp oa
WHERE oa.organization_id = org_id)'

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