CRITICAL SKILL 9.5

Use Materialized Views

So far, we have discussed several features and techniques at our disposal to improve performance in large databases. In this section, we will discuss another feature of Oracle Database 10g that we can include in our arsenal: materialized views.

Originally called snapshots, materialized views were introduced in Oracle8 and are only available in the Enterprise Edition. Like a regular view, the data in a materialized view are the results of a query. However, the results of a regular view are transitory—they are lost once the query is complete and if needed again, the query must be reexecuted. In contrast, the results from a materialized view are kept and physically stored in a database object that resembles ...

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