退化映射 的英文怎麼說
中文拼音 [tuìhuàyìngshè]
退化映射
英文
degenerate mapping- 退 : 動詞1 （向後移動） retreat; draw back; move back 2 （使向後移動） cause to move back; remove; wit...
- 映 : 動詞1. （因光線照射而顯出物體的形象） reflect; mirror; shine 2. （放映） project a movie
- 射 : Ⅰ動詞1 （用推力或彈力送出） shoot; fire 2 （液體受到壓力迅速擠出） discharge in a jet 3 （放出） ...
- 退化 : become vestigial; degenerate; deteriorate; retrograde; devolution; retrogradation; retrogression;...
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Therefore, more challenges have arisen for query optimization in database grid than traditional distributed database. following this observation, the design of a query optimizer in dartgrid ii is presented, and a heuristic, dynamic and parallel query optimization approach to processing query in database grid is proposed. a set of semantic tools supporting relational database integration and semantic - based information browsing has also been implemented to realize the above vision
克服數據庫網格特性所帶來的困難需要為數據庫網格提供全局一致的數據表達模式各結點數據模式到全局模式之間的映射方法各結點之間負載平衡和結點動態加入和退出系統的控制策略數據庫網格查詢優化器結構設計以及一整套適合數據庫網格的查詢優化演算法。
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