Efficient Memoization Algorithms for Query Optimization: Top-Down Join Enumeration through Memoization on the Basis of Hypergraphs formatIsbn:Softcover - 9783954893362 000 Jahren

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Efficient Memoization Algorithms for Query Optimization: Top-Down Join Enumeration through Memoization on the Basis of Hypergraphs formatIsbn:Softcover - 9783954893362 000 JahrenFor a DBMS that provides support for a declarative query language like SQL, the query optimizer is a crucial piece of software. The declarative nature of a query allows it to be translated into many equivalent evaluation plans. The process of choosing a suitable plan from all alternatives is known as query optimization. The basis of this choice are a cost model and statistics over the data. Essential for the costs of a plan is the execution order of