October 2008
Intermediate to advanced
352 pages
10h 30m
English
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Cascading Caches
In Example 12-2, we joined against a named query subselect to create our view. We noted that this query could also be recast as a full-fledged view in its own right. By extension, it could also be recast as a materialized view.
If that were the case, we would be cascading two materialized views. The inner materialized view would be concerned with orders and ticket purchases, and the outer view would no longer need to watch those tables directly. Instead, the outer materialized view would maintain triggers on the inner materialized view.
Working this way can reduce the complexity of any given materialized view. It also speeds up the inner view, for cases where there are other uses for that data. Implementing a cascading materialized view is left as an exercise for the readers.
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