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query optimization

См. также в других словарях:

  • Query optimization — is a function of many relational database management systems in which multiple query plans for satisfying a query are examined and a good query plan is identified. This may or not be the absolute best strategy because there are many ways of doing …   Wikipedia

  • Query optimizer — The query optimizer is the component of a database management system that attempts to determine the most efficient way to execute a query. The optimizer considers the possible query plans for a given input query, and attempts to determine which… …   Wikipedia

  • Query plan — A query plan (or query execution plan) is a set of steps used to access or modify information in a SQL relational database management system. This is a specific case of the relational model concept of access plans.Since SQL is declarative, there… …   Wikipedia

  • Conjunctive query — In database theory, a conjunctive query is a restricted form of first order queries. A large part of queries issued on relational databases can be written as conjunctive queries, and large parts of other first order queries can be written as… …   Wikipedia

  • Web search query — A web search query is a query that a user enters into web search engine to satisfy his or her information needs. Web search queries are distinctive in that they are unstructured and often ambiguous; they vary greatly from standard query languages …   Wikipedia

  • Search engine optimization — SEO redirects here. For other uses, see SEO (disambiguation). Internet marketing …   Wikipedia

  • Nexus (Process integration and optimization) — Nexus Screenshot of Nexus 1.1.05 Developer(s) iChrome …   Wikipedia

  • Database — A database is an organized collection of data for one or more purposes, usually in digital form. The data are typically organized to model relevant aspects of reality (for example, the availability of rooms in hotels), in a way that supports… …   Wikipedia

  • Relational algebra — Not to be confused with Relation algebra. Relational algebra, an offshoot of first order logic (and of algebra of sets), deals with a set of finitary relations (see also relation (database)) that is closed under certain operators. These operators …   Wikipedia

  • Feature Oriented Programming — (FOP) or Feature Oriented Software Development (FOSD) is a general paradigm for program synthesis in software product lines. FOSD arose out of layer based designs of network protocols and extensible database systems in the late 1980s cite web |… …   Wikipedia

  • Microsoft SQL Server — Developer(s) Microsoft Stable release SQL Server 2008 R2 (10.50.2500.0 Service Pack 1) / July 11, 2011; 4 months ago …   Wikipedia

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