Materialized View with Join for FAST Refresh

Question

Hi Gurus,
Facing issues in MV with a simple join for FAST Refresh.
2 sample Tables:
1. employee
empid integer PK
empname varchar(50)
deptid integer FK
2. delta_employee
empid integer PK
empname varchar(50)
deptid integer FK
dmlflag varchar(2)
watermark integer
Code is as given below -
CREATE MATERIALIZED VIEW LOG ON work.employee
WITH SEQUENCE,rowid(empid)
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW LOG ON work.delta_employee
WITH SEQUENCE,rowid(empid)
INCLUDING NEW VALUES;
CREATE MATERIALIZED VIEW work.MVEmployee REFRESH force on
demand with rowid AS
select e.empid,e.empname,e.deptid,d.empid t1
from work.employee e, work.delta_employee d
where e.empid = d.empid;
Able to perform Complete Refresh. Not able to use Fast Refresh for
incremental refresh.
Please help.
Thanks,
J Kumar

Answer 1

Found a solution,
As per oracle documentation rowid fileds should be included in the Select statement. Even though I included the rowid fields, empid in this case it still didnt work.
The implementation of the rowid column should be included with tablename.rowid instead of the tablename.columnname !
Modified script is as given below.
CREATE MATERIALIZED VIEW WORK.MVEMPLOYEE
REFRESH FORCE ON DEMAND
WITH PRIMARY KEY
AS
select e.rowid "empid",d.rowid "t1" ,e.empname,e.deptid
from work.employee e, work.delta_employee d
where e.empid = d.empid;
And It really WORKS