How to handle ORA-12053: this is not a valid nested materialized view

Question

Hi,
I've been trying to create nested MV's for a while and encountered with this error and not able to find a solution even after spending lot of time on this.
Here is the problem.
--> I've 3 base tables Tab1, Tab2, Tab3, which r not having pk's on them (restriction).
--> Created logs on these tables.
--> Created 1st level MV's with pk's (from different schema - siebel schema) defined as MV10,MV11,MV12 with required columns from each base table. These mv's r made fast/complete refresh ... doesn't matter much as complete refresh is done fast (tried both .. just in case if thatz the reason for my error msg).
CREATE MATERIALIZED VIEW mv10
REFRESH COMPLETE/FAST
WITH ROWID
AS
select
col1
,col2
FROM siebel.Tab1@dblink _name;
--> Created MV logs on MV10,MV11,MV12.
--> Created 2nd level MV (join MV) that is based on MV10,MV11,MV12 having join and filter coniditions ... and this gives the error.
I think i've followd all the rules for nested MV and Fast Refreshable rules, but for some reason not able to make it work. Plz throw some light on this.
Thanks
Srinivas Vemuri

Answer 1

You will need to use WHEN OTHERS EXCEPTION handler which is not a good idea to do so if you dont handle the same approprialtly then the exception would go un-noticed:
SQL> ed
Wrote file afiedt.buf
  1  begin
  2  execute immediate 'drop table my_Test';
  3  exception
  4  when others then
  5  dbms_output.put_line(SQLCODE||SQLERRM);
  6* end;
SQL> /
-942ORA-00942: table or view does not exist
PL/SQL procedure successfully completed.
SQL>