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Materialized view becoming invalid after a DML on base table(s)

edited Oct 2, 2012 8:00PM in Database DataWarehousing (MOSC) 3 commentsAnswered
Here is my question.  I have a materialized view that is refreshed on a daily basis. Immediately after it is refreshed, it shows a valid status.  But, a few minutes later, due to a DDL or DML occuring on the base tables, the materialized view becomes invalid.  I can query it and get records back. Is this normal behavior or a bug?

A sample of the create materialized view is listed below, with the refresh statement at the very end:

CREATE MATERIALIZED VIEW "SCOTT"."MV_SAMPLER"  
  TABLESPACE "TEST_DATA"
  BUILD IMMEDIATE
  USING INDEX TABLESPACE "TEST_INDEX"
  REFRESH FORCE ON DEMAND

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