April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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Вывод explain 155
"indexBounds": {...}
Описание того, как использовался индекс, с указанием диапазонов
пройденного индекса. В этом примере, поскольку первое предло-
жение в запросе было точным соответствием, индексу нужно было
только посмотреть на это значение: 42. Второй ключ индекса был сво-
бодной переменной, потому что в запросе не было указано никаких
ограничений. Таким образом, база данных искала значения между
отрицательной бесконечностью ("$minElement": 1) и бесконечностью
("$maxElement": 1) для имен пользователей в пределах "age": 42.
Посмотрим на немного более сложный пример. Предположим, у вас есть
индексы
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