Cost-Based Oracle Fundamentals
	Категория: Компьютерная литература » Базы данных » Oracle
		Автор: Jonathan Lewis Издательство: Apress Год издания: 2006 isbn: 1590596366 Количество страниц: 537 Язык: english Формат: PDF Размер: 5 Мб Каталожный номер: 52013	Put simply, the Oracle CBO is a mathematical model; you feed it inputs (queries, statistics), and it produces outputs (query plans). In order to use the CBO successfully, it is critical that you understand what these inputs are and how the CBO uses them. Consider the following question, one that I’ve tried to answer many times: What is the best way to collect statistics, what statistics should I gather? Seems simple enough, very straightforward—there should be an answer and there is, but it is no “one size fits all” answer. It depends on your circumstances, your data distribution, your queries, the type of system you have (transactional, data warehouse)—a whole host of factors—and it is only through an understanding of how the CBO works and of how these factors affect the CBO that you’ll be able to answer the question for yourself. Ключевые теги: Oracle
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	0 Опубликовал: toksoft | 15-03-2011, 08:16 | Просмотров: 1072   Комментарии (0)  Печать