July 2024
Beginner to intermediate
272 pages
5h 40m
Japanese
Content preview from アーキテクトの教科書 価値を生むソフトウェアのアーキテクチャ構築
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231
5
その場合は、ボトルネックを特定した上でチューニングを行います。
一般的には、データベースサーバーのような共有リソースで先にボト
ルネックが生じることが多いと言えます。その場合はデータベースのパ
ラメーターチューニングや、SQLクエリの改善などで解消を図ること
になります。
Column
スケールアップとスケールアウト
システムの構成を拡張して処理能力を上げることを、システムをスケール
させるという言い方をします。スケールの方法には大きく二つあります（図
5.3.5）。
スケールアップは、サーバーのリソース（CPU、メモリ、ディスク容量な
ど）を追加することでシステムを拡張する方法です（❶）。垂直スケーリング
と呼ばれることもあります。サーバーの物理的な制約やOSの制約によって
スケールアップできるリソースのサイズには上限があります。
スケールアウトは、サーバーの数を増やし負荷を分散させることで、シス
テム全体の処理能力を上げる方法です（❷）。水平スケーリングと呼ばれる
こともあります。また、複数のサーバーを立てることで冗長性が増すため、
システムの可用性向上にも繋がります。
⹅
図5.3.5
スケールアップとスケールアウト
❷スケールアウト
スケール前 スケール後
❶スケールアップ
232
以上より、全般的にはスールアウトの方が優れていると言えますが、サー ...
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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.