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Is it possible to overcome these limitations with a fast refresh materialized view? SNAPTIME$$ > :1 ) AS OF SNAPSHOT (:2) "MAS$" )) "AV$" GROUP BY "AV$"."CUSTOMER_ID" We can see that these DELETE and INSERT statements are fairly complicated for even our simple mview query.As our mview query goes from simple to complex, the logic to generate the appropriate DELETE and INSERT statements becomes more and more difficult.Yes, but not solely within the functionality of mviews that Oracle provides.To make this work we are going to need to utilize mviews in conjunction with an additional table we create and some PL/SQL. In the simple mview example, Oracle was deleting and re-inserting the MAX value based on the changes that it saw in the mlog table.For example, we could add a SUM aggregate function, or a COUNT aggregate that includes a CASE statement.We won’t go into all the different ways an mview query could become complex here.This can now been mitigated with the CONCURRENTLY keyword: A unique index will need to exist on the materialized view though.

updating materialized view-12updating materialized view-23

After we have the aggregate data we need in this new table, we will create a materialized view on top of both the original table and this new aggregate table.

The example above shows that a simple mview with an aggregate function will fast refresh, but what happens when the mview query becomes more complex?

As we will see, the fast refresh ability starts to fail.

They are created with the for update clause during creation without then adding the materialized view to a materialized view group.

In such a case, the materialized view is updatable, but the changes are lost when the materialized view refreshes.




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