directed acyclic graph dag 中文意思是什麼
directed acyclic graph dag
解釋
有向無回圖-
The dependency structure between packages must be a directed acyclic graph ( dag ). that is, there must be no cycles in the dependency structure
包之間的依賴結構必須是一個直接的無環圖形( dag ) 。也就是說,在依賴結構中不允許出現環(循環依賴) 。 -
In this paper, we use directed - acyclic graph ( dag ) to represent a query processing, then define a cost model and a query efficiency model, and finally put forward an algorithm for materialized views selection
在考慮空間約束的基礎上,提出一種物化視圖選擇方法,並給出了切實可行的演算法步驟。
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