Want to create a Read Only user for a given app owner user

Question

Hi Folks,
We have an application owner schema, lets call it OWNER, which has different objects living under it.
Now, for certain reasons, the app group wants a read only user which should be able to view objects living only in OWNER. It would only be able to read things, and have no create or alter types of priv to be able to change anything.
The first idea was to create a new user (e.g. RO) and give this explicit grants (select only) for all objects in OWNER. Though this works, is a maintenance havoc, since everytime there is a new object in OWNER, you have to remember to give explicit grants to all RO (or RW ) kind of users.
What i am looking forward to is, some sort of privilege or role concept that apply on the user level, and not on object level. something that allows me to say, all objects of this schema (e.g. OWNER) are visible to user RO. Other restrictions on RO would control read or write behaviour.
Does this thing exist ? please point me to the documentation/example..
regards
raghav..

Answer 1

CREATE OR REPLACE TRIGGER myTest.trg_mytest
AFTER DDL
ON myTest.SCHEMA
DECLARE
     lv_obj_type VARCHAR2(20) := TRIM(UPPER(ora_dict_obj_type));
     lv_evt_type VARCHAR(20)      := TRIM(UPPER(ora_sysevent));
     lv_obj_name     VARCHAR2(30) := trim(UPPER(ora_dict_obj_name));
     lv_role_name     VARCHAR2(30) := 'myTest_RO';
     lv_stmt          VARCHAR2(4000) := NULL;
     ln_job_nr     NUMBER;
BEGIN
     IF lv_evt_type != 'GRANT' --lv_obj_type <> 'OBJECT PRIVILEGE' --
     THEN
          DBMS_JOB.SUBMIT(ln_job_nr,'begin execute immediate ''grant ' || ' select on ' ||
                                   lv_obj_name || ' to ' || lv_role_name || '''; END;');
     END IF;
   INSERT INTO TB_EVT_LOG(d_date, description)
   VALUES(SYSDATE,  lv_obj_name || '~~~~ created ' || lv_obj_type || '~~~~' || lv_evt_type );
   EXCEPTION
     WHEN OTHERS THEN
       RAISE;
END trg_mytest;
/This works. But, my problem is that it is not able to filter out the Grant statement itself, Its logging an entry for the grant (as a ddl operation as well).
what am I doing wrong here ?
regards
raghav..