May 2019
Intermediate to advanced
464 pages
9h 22m
Japanese
Content preview from Node.jsデザインパターン 第2版
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332
10
章 スケーラビリティとアーキテクチャ
（
sharding
）」と呼ばれます。この方法では、同じアプリケーションの複数のインスタンスがあって、そ
れぞれがデータの一部分を処理しますが、どの部分を処理するかはさまざまな基準で決められます。
たとえばアプリケーションのユーザーを分割するのに国を使ったり（リスト分割：
list partitioning
）、姓
の最初の文字を使ったり（範囲分割：
range partitioning
）、ハッシュ関数でユーザーが所属する区分を
決めたり（ハッシュ分割：
hash partitioning
）します。分割された各区分（パーティション）はそれぞれ
個別のインスタンスに割り当てられます。データ分割を使うと、与えられたデータを扱うべきインスタ
ンスがどれなのかを決定する探索のステップを各処理の前に実行することが必要になります。先に述
べたように、データ分割は、主な目的がモノリシックな巨大データセットを扱うことに関する問題
（ディ
スクスペース、メモリ、ネットワーク容量などの限界）を克服することなので、データベースレベルで
適用され処理されるのが普通です。アプリケーションレベルでの適用が考慮の対象となるのは複雑な
分散アーキテクチャの場合や、非常に限られたユースケースの場合で、たとえばデータ永続性を独自
の方法で行っているアプリケーションを構築するとき、データ分割をサポートしていないデータベース
を使用しているとき、あるいは
Google
規模のアプリケーションを構築するとき
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
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.