July 2010
Intermediate to advanced
448 pages
12h 22m
English
Content preview from Physical Database Design
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5.7 Summary 95
5.7 Summary
Materialized views are the results of a query stored to disk. Effectively a materialized
view caches calculations, permitting the reuse of the results, which leads to faster query
responses. The number of possible views is typically extremely large, requiring the data-
base designer to pursue the selection of a strategic set of materialized views. A good heu-
ristic is to focus on frequent queries, which also consume large amounts of disk I/O.
Each query naturally maps to a view. Product graphs and lattice structures can capture
the relationships between views, facilitating the choice of views to materialize. Good
candidates ...
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