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Cost-Based Oracle Fundamentals

Программирование

Автор: Lewis Jonathan

Язык: русский

Добавила: Sveta 14 Авг 15

Проверила: Sveta 14 Авг 15

Формат: PDF (10728 Kb)

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Аннотация

Cost-Based Oracle Fundamentals - The question, «Why isn’t Oracle using my index?» must be one of the most popular (or perhaps unpopular) questions ever asked on the Oracle help forums. You’ve picked exactly the right columns, you’ve got them in the ideal order, you’ve computed statistics, you’ve checked for null columnsand the optimizer flatly refuses to use your index unless you hint it. What could possibly be going wrong?