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- Query_optimization abstract "Query optimization is a function of many relational database management systems. The query optimizer attempts to determine the most efficient way to execute a given query by considering the possible query plans. Generally, the query optimizer cannot be accessed directly by users: once queries are submitted to database server, and parsed by the parser, they are then passed to the query optimizer where optimization occurs. However, some database engines allow guiding the query optimizer with hints.A query is a request for information from a database. It can be as simple as "finding the address of a person with SS# 123-45-6789," or more complex like "finding the average salary of all the employed married men in California between the ages 30 to 39, that earn less than their wives." Queries results are generated by accessing relevant database data and manipulating it in a way that yields the requested information. Since database structures are complex, in most cases, and especially for not-very-simple queries, the needed data for a query can be collected from a database by accessing it in different ways, through different data-structures, and in different orders. Each different way typically requires different processing time. Processing times of a same query may have large variance, from a fraction of a second to hours, depending on the way selected. The purpose of query optimization, which is an automated process, is to find the way to process a given query in minimum time. The large possible variance in time justifies performing query optimization, though finding the exact optimal way to execute a query, among all possibilities, is typically very complex, time consuming by itself, may be too costly, and often practically impossible. Thus query optimization typically tries to approximate the optimum by comparing several common-sense alternatives to provide in a reasonable time a "good enough" plan which typically does not deviate much from the best possible result.".
- Query_optimization wikiPageExternalLink 487912.html.
- Query_optimization wikiPageExternalLink chaudhuri98overview.html.
- Query_optimization wikiPageID "3480761".
- Query_optimization wikiPageRevisionID "603997564".
- Query_optimization hasPhotoCollection Query_optimization.
- Query_optimization subject Category:Database_algorithms.
- Query_optimization subject Category:Database_management_systems.
- Query_optimization subject Category:SQL.
- Query_optimization type Abstraction100002137.
- Query_optimization type Act100030358.
- Query_optimization type Activity100407535.
- Query_optimization type Algorithm105847438.
- Query_optimization type Code106355894.
- Query_optimization type CodingSystem106353757.
- Query_optimization type Communication100033020.
- Query_optimization type DatabaseAlgorithms.
- Query_optimization type DatabaseManagementSystem106588785.
- Query_optimization type DatabaseManagementSystems.
- Query_optimization type Event100029378.
- Query_optimization type Procedure101023820.
- Query_optimization type PsychologicalFeature100023100.
- Query_optimization type Rule105846932.
- Query_optimization type Software106566077.
- Query_optimization type Writing106359877.
- Query_optimization type WrittenCommunication106349220.
- Query_optimization type YagoPermanentlyLocatedEntity.
- Query_optimization comment "Query optimization is a function of many relational database management systems. The query optimizer attempts to determine the most efficient way to execute a given query by considering the possible query plans. Generally, the query optimizer cannot be accessed directly by users: once queries are submitted to database server, and parsed by the parser, they are then passed to the query optimizer where optimization occurs.".
- Query_optimization label "Optimisation de requête".
- Query_optimization label "Optimización de consultas".
- Query_optimization label "Query optimization".
- Query_optimization label "Оптимизация запросов СУБД".
- Query_optimization label "クエリ最適化".
- Query_optimization sameAs Optimización_de_consultas.
- Query_optimization sameAs Optimisation_de_requête.
- Query_optimization sameAs クエリ最適化.
- Query_optimization sameAs m.09fs7f.
- Query_optimization sameAs Q2919848.
- Query_optimization sameAs Q2919848.
- Query_optimization sameAs Query_optimization.
- Query_optimization wasDerivedFrom Query_optimization?oldid=603997564.
- Query_optimization isPrimaryTopicOf Query_optimization.