April 2020
Beginner to intermediate
540 pages
14h 14m
Russian
Content preview from MongoDB: полное руководство
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Типы индексов 161
Мы индексируем "created_at", чтобы ускорить этот запрос.
При первом запуске набор результатов очень маленький, и запрос воз-
вращается мгновенно. Но через пару недель данных становится много, и
через месяц этот запрос уже занимает слишком много времени для вы-
полнения.
Для большинства приложений это, вероятно, «неправильный» запрос:
вам действительно нужен запрос, который возвращает бóльшую часть ва-
шего набора данных? Большинству приложений, особенно с большими
наборами данных, это не нужно. Однако в некоторых допустимых случаях
вам может потребоваться бóльшая их часть или все данные. Например, вы
можете экспортировать ...
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I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.