several techniques exist to select and materialize a proper set of data in a suitable structure that manage the queries submitted to the online analytical processing systems. these techniques are called view management techniques, which consist of three research areas: 1) view selection to materialize, 2) query processing and rewriting using the materialized views, and 3) maintaining materializ...

Several techniques exist to select and materialize a proper set of data in a suitable structure that manage the queries submitted to the online analytical processing systems. These techniques are called view management techniques, which consist of three research areas: 1) view selection to materialize, 2) query processing and rewriting using the materialized views, and 3) maintaining materializ...

View materialization is known to be a valuable technique for performance optimization in relational databases, and much work has been done addressing the problem of consistently maintaining relational views under update operations. However, little progress has been made thus far regarding the topic of view materialization in objectoriented databases (OODBs). In this paper, we demonstrate that t...

This paper presents a precise correspondence between two views of taxonomic hierarchies: an intensional view based on concepts and an extensional view based on categories, i.e., subsets of the population of individuals analyzed in terms of these concepts. The correspondence is described with materialization, a generic relationship defined for object-oriented and entity-relationship information ...

Greedy based approach for view selection at each step selects a beneficial view that fits within the space available for view materialization. Most of these approaches are focused around the HRU algorithm, which uses a multidimensional lattice framework to determine a good set of views to materialize. The HRU algorithm exhibits high run time complexity as the number of possible views is exponen...

歯質に接着性 を有し, 従来か らのBlack方 式の 窩洞形成に変革 をもたらしたコンポジッ トレジン 修復法の発展には目をみはるものがある。特にコ ンポジッ トレジンのエナメル質に対する接着はり ン酸による酸処理 と接着性レジンモノマーを含む ボンディング材の併用により臨床的にはほぼ満足 のい くもの となり, 一・応の解決 をみている。 これに対 して, 象牙質に対する接着は未だ十分 なものとはいえず, 接着性能の向上をはか るため, 最近では各種象牙質前処理剤やプライマー類が開 発 され, あるものは市販されている状態にある。 しか しながら, 口腔衛生の普及や 口内清掃法の 発達により, 歯の延命が顕著 となり, 加 うるに高 齢者社会 を迎えて, 保存修復を必要 とする歯の実 質欠損の態様 も今 までとは変わ りつつあり, 特に 歯頚部, 歯根部の欠損や編蝕が増大 してい...

View materialization is a central issue in logical design of data warehouses since it is one of the most powerful techniques to improve the response to the workload. Most approaches in the literature only focus on the aggregation patterns required by the queries in the workload; in this paper we propose an original approach to materialization in which the workload is characterized by the presen...

View materialization is known to be a valuable technique for performance optimization in relational databases, and much work has been done addressing the problem of consistently maintaining relational views under update operations. However, little progress has been made thus far regarding the topic of view materialization in object-oriented databases (OODBs). In this paper, we demonstrate that ...

Data warehouses are subject oriented, consolidated, integrated, and time variant repository of possibly heterogeneous data. A data warehouse is used to response to on-line analytical queries over the millions records of data in an acceptable time. Since a data warehouse often has millions of records of data, it is an important challenge how we can reduce the time of on-line analytical processin...