April 2022
Beginner to intermediate
344 pages
9h 32m
Japanese
Content preview from はじめての設計をやり抜くための本 第2版 概念モデリングからアプリケーション、データベース、アーキテクチャ設計、アジャイル開発まで
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NoSQL
データベース設 計
前節の「データベース論理設計」では RDB（Relational Database）を前
提とした設計について説明しました。現在でもRDBはデータの格納先とし
て主要なものであることには変わりはありませんが、他の選択肢として
NoSQLデータベースがあります。NoSQLデータベースという言葉の意味は、
SQLだけではない（Not only SQL）ということで、簡単にいえばRDB以外
のデータベースを指します。RDBは正規化された構造化データを格納しま
すが、NoSQLでは半構造データや非構造データを格納することができます。
NoSQLはスケーラビリティが高く、高性能です。その代わりトランザク
ション制御を省略して（P209 トランザクションの制御を参照）、ACIDを一
部緩和しています。NoSQLでもロックを使えばACIDを実現できるといっ
たインターネット上の記事もありますが、ロックを乱用するとNoSQLの利
点を失うことになり、RDBよりも性能が悪くなることもあります。常に
RDBよりもNoSQLの性能が良いわけではなく、それぞれの特性にあわせた
適用をすべきです。
167
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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.