April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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160 Глава 5. Индексы
Если запрос не использует нужный вам индекс и вы исполь-
зуете метод
hint, чтобы изменить его, запустите explain
перед развертыванием. Если вы заставите MongoDB ис-
пользовать индекс для запроса, для которого она не знает,
как использовать индекс, в итоге ваш запрос может полу-
читься менее эффективным, чем без индекса.
Когда не стоит прибегать к индексированию
Индексы наиболее эффективны при извлечении небольших подмножеств
данных, а некоторые типы запросов быстрее работают без индексов. Ин-
дексы становятся все менее и менее эффективными, по мере того как вам
нужно получать бóльший процент коллекции, потому что
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