physical schema 中文意思是什麼
physical schema
解釋
實體綱目-
Abstract : in this paper, the formal definition of composite objects was presented. semantics of composite object was specified and related to object - oriented concepts. then the semantics, creation and deletion of composite object were illustrated in terms of schema definition, which shows the integration of composite objects. meanwhile, the approach of implementing composite objects, including enforcement of the semantics of composite objects and its physical clustering, was also indicated
文摘:把復合對象和面向對象的概念聯系起來，在復合對象的形式定義后，指定復合對象的語義，然後根據模式定義來說明復合對象的語義，以及復合對象的創建和刪除.展示了復合對象數據整體性.同時還指出了實現復合對象的方法，包括復合對象語義的強制和物理聚集 -
Physical data independence : the capacity to change the internal schema without having to change the conceptual schema
邏輯資料獨立：不必改變外部綱要或應用程式，即可改變概念綱要的能力。 -
The conceptual model of database is illustrated with e - r graph. after that, logical design and physical design of database are partly accomplished, and some designing principles of them are analyzed, such as external schema, cluster and index design and data type choosing
在此基礎上使用e - r數據模型描述了這些信息內容，實現了數據庫的概念設計，並部分實現了數據庫的邏輯設計和物理設計，分析了資源配置系統數據庫邏輯和物理設計的原則，如外模式、簇集、索引設計以及數據類型的選擇等。
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