Is it possible to partially refresh a materialized view in Oracle?

Question

I have a very complex Oracle view based on other materialized views, regular views as well as some tables (I can\'t \"fast refresh\" it). Most of the time, existing records

Answer 1

Partition by date as in answer 3 (skaffman).

You could just do the refresh of a normal mv(table_refreshed below) and than use the exchange keyword i.e.

ALTER TABLE all_partitions
  EXCHANGE PARTITION to_calculate
  WITH TABLE table_refreshed
  WITHOUT VALIDATION
  UPDATE GLOBAL INDEXES;

Answer 2

I have been able to refresh a single partition of a materialized view with partition change tracking.

It seems to require that the view is created with REFRESH FAST WITH ROWID option and DBMS_MVIEW.REFRESH is called with 'P' method.

Answer 3

You can partition materialized views just as you can with normal tables. Partition your mview by date, and then you can refresh only the required partition.

Answer 4

After more reading and judging by the lack of answers to this question, I come come to the conclusion that it is not possible to refresh a single partition of a materialized view.

If you can give a syntax example that proves otherwise, I will happily mark your answer the accepted one.

To others who might find this questions useful in the future: you might also want to know that in Oracle 10g, refreshing a partition (or any mview) will cause Oracle to issue DELETE, followed by INSERT.

If this is giving you performance problems (like me), there is an option to use atomic_refresh => false, which will TRUNCATE, then INSERT /*+APPEND*/.