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- W2103731415 abstract "Semantic Query Optimisation (SQO) in Relational Database Management Systems (RDMSs) is a query optimisation ap- proach which uses rules learned from past queries in order to execute new queries more intelligently without accessing database, whenever possible. The approach is composed of several components: Query Representation, Query Optimisation, Automatic Rule Derivation and Rule Maintenance. This paper focused on the query optimisation component. In RDMSs, during the traditional SQO, different alternative queries of a given query can be constructed us ing matching rule(s) from the rule set, and then its optimiser selects one of the alternatives as an optimum query which will give the same answer set but it can be executed faster than the original query. One of the main problems occurs during this process is to have many matched rules e.g., if the number of the rules is N , the number of the alternative queries is 2 N 1. The construction and the optimisation of these alternatives also take time in ad dition to the execution of the query. In order to overcome this problem, in this paper we propose a new Rule Evaluation Algorithm. The main goal of the algo- rithm is to evaluate matching rule(s) and select useful/promising rules. And then use selected rules to construct an optimum query. The algorithm can answer the question of the utility of rules in the query optimisation. The system of the approach based on the algorithm has been implemented and its computational results are given. The experimental results show that the algorithm can trim the number of the rules significantly." @default.
- W2103731415 created "2016-06-24" @default.
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- W2103731415 date "2013-09-01" @default.
- W2103731415 modified "2023-09-26" @default.
- W2103731415 title "Rule Evaluation Algorithm for Semantic Query Optimisation" @default.
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- W2103731415 doi "https://doi.org/10.12785/amis/070515" @default.
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