Multi-OU selection in PL/SQL

Question

Hi
I get a requirement of providing View which contains records of Multi-OU transactions to other DB via DB-Link.
All the processes are in backend, and invoking several seeded DB functions of EBS 12.1.3. The functions using synonym for Multi-Org Access but not the base table, thus have to initialize the DB session for Multi-OU.
The steps I have made:
1. Setup a responsibility for Multi-Org Access
2. Initialize the DB session
    fnd_global.apps_initialize(user_id      => user_id1,
                               resp_id      => responsibility_id1,
                               resp_appl_id => application_id1
    mo_global.init('PO');
    MO_GLOBAL.SET_POLICY_CONTEXT(p_access_mode => 'M', p_org_id => null);
3. Write a customized function xx_function to invoke seeded functions, and then using in the view as a column. Since mo_global.init including DML actions, also use AUTONOMOUS_TRANSACTION in xx_function.
Here comes the problem:
SQL Statement1, return 0 record:
select xx_function(txn.id) from transaction_table txn;
SQL Statement2, return normal value;
select xx_function(1000) from dual; --1000 is a detail transaction ID.
Is there any restriction to use mo initialize directly in select sql?
Please help me.
Best Rgds
James

Answer 1

I'm not sure what you're trying to accomplish, but you could be talking about "DIY Parallelism" (as Tom Kite calls it).
This is where you process rows within mutually exclusive ranges of some primary key value. Like this:
UPDATE <some table>
SET  <some col> = <some value>
WHERE  unique_key BETWEEN min_val AND max_val;Put this into a package and fire off several copies of it at once, calling each one with different ranges.
Whether you'll get any performance benefit will depend on many factors, but in my case it worked like a champ. I created 8 threads and it brought the run time of my procedure from 2 hours down to 40 minutes. During the day, our server has lots of spare CPU cycles.
You have to be careful in the procedure, because if you go this route you need to change all the SQL statements to use it or you'll update the same rows 8 times.