Analytical modeling of materialized view maintenance

A matenahzed view 1s a stored copy of the result of retrlenng the view from the database We conalder here, news that can be constructed from the relational algebra operations select, project and Jorn Also aggregates such as sum or count over views are considered Conventional systems use query mo&ficatlon, where the query on a view IS modified to operate on one or more of the base relations, [STON 751 Materlahnng a view before a query IS made on It has been a recent proposal