M$view need to create with Fast Refersh?

Question

Hi All,
I have to create m$veiw with Fast Refresh for only two table join.
CREATE MATERIALIZED VIEW pup_sub_poc_mv
REFRESH FAST
START WITH SYSDATE
NEXT SYSDATE+(1/48)
select a,b,c
from x, y
where x.id=y.id
and x.a in (select a from z)
i am getting below error below error.
ORA-12015: cannot create a fast refresh materialized view from a complex query
Is there any way to create Fast refresh view for above query.?

Answer 1

Try this, I think EXISTS is suported for fast refersh, IN is not - It is Documented
CREATE MATERIALIZED VIEW pup_sub_poc_mv
REFRESH FAST
START WITH SYSDATE
NEXT SYSDATE+(1/48)
select a,b,c
from x, y
where x.id=y.id
and exists (select null from z where x.a = z.a)Just got it tested:
SQL> create materialized view log on emp;
Materialized view log created.
SQL> create materialized view log on dept;
Materialized view log created.
--"Trying with IN. Error"
SQL> create materialized view mv2
  2  REFRESH FAST
  3  START WITH SYSDATE
  4  NEXT SYSDATE+(1/48)
  5  as select * from emp where deptno in (select deptno from dept);
as select * from emp where deptno in (select deptno from dept)
ERROR at line 5:
ORA-12015: cannot create a fast refresh materialized view from a complex query
--"Trying with EXISTS."
SQL> create materialized view mv2
  2  REFRESH FAST
  3  START WITH SYSDATE
  4  NEXT SYSDATE+(1/48)
  5  as select * from emp where exists (select null from dept where dept.deptno = emp.deptno);
Materialized view created.Edited by: jeneesh on Oct 12, 2012 4:47 PM