嵌套圖層 的英文怎麼說
中文拼音 [qiàntàotúcéng]
嵌套圖層
英文
nested layers-
This paper decomposes materialized views maintenance into ods / db interface and dw / ods interface. multiple data sources with concurrent updates may result in update anomalies of the materialized views. so at ods / db interface this paper introduces an improved nested transaction model - based transaction concurrency control mechanism to maintenance views in ods on line
本文把視圖的一致性維護問題分解到三層結構的ods / dw和dw / ods兩個介面上分別實現，並且引入視圖生成樹的概念，在ods / db介面處採用基於改進嵌套事務模型的並發控制機制，聯機維護ods的數據，大大提高了視圖維護過程中的並發度和靈活性。The historical development of bom technique is reviewed from theory and practice, and the analysis, design and optimization strategy of relational database based bom are presented. in the flowing section, the paper analyzes traditional bom search algorithms and proposes some optimization algorithms, and then, through applying dag to bom technique, the bom cyclic nesting error check algorithms and low - lever code algorithms are improved as well
本文重點研究了bom技術的研究現狀，提出了基於關系型數據庫的bom的分析、設計和優化策略；並且對bom的常用遍歷演算法進行分析后對其進行改進；將dag圖運用到bom技術上對bom的循環嵌套錯誤檢查的演算法和低層碼的演算法進行改進。Aiming at this kind of problem a method utilizing the division of assembly unit was put forward to carrying out division of layers ; the layered orientation graph model of the information of assembling positioning relationship was expressed in every layer by the use of embedded orientation graph
針對這種問題，提出利用裝配單元劃分的方法進行分層；在每層中，用嵌套式的有向圖表示裝配定位關系信息的分層有向圖模型。
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