Materialized views are, along with indexes, the most important thing in a DB to improve performance of complex joins in tables that are not updated so frequently. Having a good knowledge of it is very important, so, finish this topic only when you understand very well it's usage.
Most important thing here, as the topic says is:
- Enable Query REWRITE
- Enable FAST refresh
And to do that you need to understand:
- How to create MVIEW and MVIEW LOGs;
- Refresh types (Complete/Fast/Force/Never);
- QUERY_REWRITE_INTEGRITY parameter;
- Requirements for Using Materialized Views with Aggregates;
- Creating prebuilt mviews;
Path to Documentation:
Oracle Database Data Warehousing Guide -> Basic/Advanced Materialized Views
Oracle Database Data Warehousing Guide -> Basic/Advanced Query Rewrite
Oracle Database SQL Language Reference -> CREATE MATERIALIZED VIEW (LOG)
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