By Laura C. Rivero, Jorge H. Doorn, Viviana E. Ferraggine
There are a myriad of latest instructions within which databases are starting to be, proposing new and intriguing demanding situations that promise flux within the entire society, as a result of the influence and alterations the database structures have provoked nearly all over in sleek existence. This levels from the best way the firms function and make their company judgements, to using moveable units with database involvements. The Encyclopedia of Database applied sciences and purposes is a wide-ranging selection of diversified insurance of subject matters concerning database thoughts, applied sciences, and functions - supplying an outline of the state of the art of classical matters. It additionally supplies transparent and concise reasons of rising concerns and applied sciences akin to multimedia database structures, information warehousing and mining, geospatial and temporal databases, and knowledge opposite engineering. Contributions from thousands of foreign researchers make this e-book a valuable unmarried reference resource in any library with regards to database applied sciences and functions.
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Un modèle d’exécution paramètrique pour systèmes de bases de données actifs. PhD thesis, University Joseph Fourier. , & Collet, C. (1998). Semantics based implementation of flexible execution models for active database systems. Actes des 14ièmes Journées Bases de Données Avancées, (pp. 405-424). , & Tanca, L. (1995, December). A structured approach for the definition of the semantics of active databases. ACM Transactions on Database Systems, 20(4), 414-471. K. (1998). FRAMBOISE: An approach to framework-based active database management system construction.
Whenever a query comes in that needs to aggregate the fact table on exactly those aggregates and dimensions (or sometimes, a subset of them, as some aggregates can be computed stagewise), we use the summary table instead of the fact table. Since the summary table is usually much smaller than the fact table due to the grouping, the query can be processed much faster. However, in order to use materialized views in a data warehouse, two questions must be answered: • Many aggregations are possible, which ones to materialize?
Materialized views offer the advantage that can be used to precompute part of a query and then reused as many times as needed. The main challenge about materialized views is to keep them updated when the relations on which they were defined change; incremental techniques are used to make this efficient. Outerjoin: Extension of the regular join operator. , a regular join); plus (b) all the tuples in R that do not have a match in S fulfilling C, padded with null values on the attributes of S; plus (c) all the tuples in S that do not have a match in R fulfilling C, padded with null values on the attributes of R.