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Looking for : query plan
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lantian.doc
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The query optimizer is a module that examines equivalent query plans and chooses the plan that needs the least amount of cost. ... A search space of plans : the set of all plans that can be used to answer a given query. ...
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Plan Generator Overview
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The Plan Generator is responsible for generating query plans in C-Store. ... There is always one root node. This is an example of a query plan. ...
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oracle_studio_4.doc
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In this studio, you will learn how to use the Oracle query optimizer. The query optimization process consists of two main steps: generating alternate query plans and estimating the cost of these plans using prior information about the relations. ...
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Lecture Notes.doc
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The Explain Plan statement puts rows in a "plan_table" to represent individual procedural steps in a query plan. ... Recall that a Query Plan is a sequence of procedural access steps that carry out a program to answer the query. ...
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Parametric query optimization (PQO) attempts to solve this problem by exhaustively determining the optimal plans in each point of the parameter space at compile time. ... build a parametric plan during several executions of the same query. ...
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Multi - objective query optimization in a P2P Database System
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As a matter of fact, we should be able to rank the peers contributing to a plan, and thus the plans themselves, according to data quality metrics allowing to discard plans producing poor quality query results (according to a threshold either set by the user or the system) ...
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