materialized view 中文意思是什麼

materialized view 解釋
物化視圖
  • view : n 1 看，望；眺望，展望；觀察，考察。2 視力；視域，視野，眼界。3 看見的東西，風景，情景，景色；風...
  1. If relevant, then checks whether it is concurrent incremental maintainable or self - maintainable. if the update satisfies self - maintenance, our mechanism queries auxiliary views ( instead of querying iss ) to avoid network transmission and make the materialized view consistent with underlying iss. the update which needs to maintain the view concurrently and incrementally can be handled by polec

    當收到更新后， pmdvm方法首先用相關性對其檢查，對不相關更新直接拋棄；對相關更新對其進行並發增量視圖維護或自維護機制檢查，對滿足自維護的更新通過查詢輔助視圖（而不是查詢數據源）來避兔網路傳輸和使實化視圖與底層的數據源保持一致，對必須進行並發增量視圖維護的更新由polec來處理。
  2. A data warehouse stores materialized view over data from one or more sources in order to fast access to integrated data

    為了對一個或多個數據源聚集數據快速查詢，我們通常在數據倉庫中保存物化視圖。
  3. Otherwise, if a view is not selected, all the cells in this view will not be materialized. this strategy results in the unstable query performance

    這樣的物化方式所產生的一個後果就是物化視圖中的數據與非物化視圖中數據在查詢性能上差別很大。
  4. 20 wang s, gao y, chen t y, zhang k l. study of two - layer trust model in service grid based on behavior. computer applications, 2005, 25 : 1974 - 1977. 21 qin b, wang s, du x y. materialized view maintenance in peer data management systems

    提出一種可擴展的分散式數據結構linknet ，以支持大規模p2p系統的搜索，提出一種高效率的分層的top - k查詢方法，另外，在信任管理更新管理節點間知識共享等方面都做了創新的工作。
  5. We often store the data in the warehouse as materialized view to speedup query processing on large amount of data. these views need to be maintained in respond to update in the source data

    目前對數據倉庫的實時更新普遍採用視圖維護更新方式，視圖的自維護和一致性維護是數據倉庫更新的重要問題。
  6. Research of materialized view selection based on ao view graph

    的實視圖選擇演算法的研究
  7. Materialized view maintenance and drill - down at the warehouse span multiple sources

    多數據源數據倉庫實體化視圖維護與下查
  8. We show that the warehouse views can be made self - maintainable with the auxiliary views, which derived from the intermediate result of the view computation can be materialized in the warehouse. the incremental maintenance algorithm can implement warehouse real - time updating

    文中介紹了一種利用視圖計算的中間結果創建輔助視圖，在數據倉庫中進行實體化，計算實視圖和輔助視圖的精確變化，實現數據倉庫的增量維護演算法。
  9. In a traditional algorithm, when a view is selected, all the cells in this view are to be materialized

    也就是說，在data cube中某個視圖的所有數據要麼全部為物化，要麼全部不被物化。
  10. After receiving the updates from iss, the materialized views are re - evaluated incrementally by use of the algorithm such as ega, strobe and olec etc. olec algorithm overcomes the disadvantages of ega and strobe without additional local compensation and dw no need to be static when incremental view commits

    Olec演算法克服了eca演算法和strobe演算法的缺點，它不需要額外的本地補償操作，視圖增量提交時也不需要數據倉處于靜止狀態。
  11. For implementing this idea, this dissertation is about the study of data integrator based on view monitor agent, with emphases on designing the integrator software structure and further realizing the maintenance for multi sources. and we melioiate the implement of integrator as following : ? aving the ability of automatically creating the smallest size of source views by decomposing the definition of a materialized view ; ? supplying the integration rules which can be predefined and used to manage materialized views to meet complicated demands of application. according to the above demands, the relevant research and implement work including the following aspects : firstly we propose the new system structure of integrator and introduce every module ' s function

    針對以上要求，相關的研究實現工作包括以下內容：提出了集成器的軟體結構，介紹了各個模塊的功能；設計了集成規則的庫結構，給出了集成規則所包含的屬性和意義，實現了管理集成規則的介面，並提供前端工具以方便用戶對集成規則的管理；提出了基於源視圖的分解演算法思想並作了初步推導，但結論還有待改進；對于集成器的核心部件? ?集成代理，我們給出了軟體功能構成，描述了採用的自維護演算法，討論了演算法達到的數據一致性程度；最後是和監視代理的介面處理部分，主要討論了各種通信數據流的數據表示方法。
  12. In dolap, washington dc, usa, 2000, pp. 1 - 8. 11 liang w, wang h, orlowska m. materialized view selection under the maintenance time constraint

    如果，獲取節點n的某個維的所有孩子節點的值的代價很小的話，就沒有必要存儲節點n的值。
  13. If each accessing to global view must be translated into accessing to ldb, the cost will be very expensive. so there are materialized views in most multidatabase

    如果每一次對全局視圖的訪問都要轉換為對底層數據庫的訪問，代價是很昂貴的，所以多庫系統中一般都保持一個物理的全局視圖。
  14. A dw is intended to satisfy a set of queries. the materialized views in a dw relate to each other in a complex manner, through common sub - expressions, in order to guarantee high query performance and low view maintenance cost

    通過對現有的基表實視圖和導出實視圖維護技術的分析，結合業務智能的理論和數據倉庫理論等，給出了一種動態的數據倉庫實視圖管理機制。
  15. However, the materialized view must obtain some necessary information from iss. as more and more data is added to the dw, it increases the space complexity and gives rise to information redundancy which might lead to an inconsistent dw extent

    然而，實化視圖仍必須從數據源獲得必要的信息，大多數更新操作不能使用實化視圖可自維護來演算，而且它增加了空間復雜性並導致信息冗餘上升。
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