May 2019
Beginner to intermediate
296 pages
6h 58m
Japanese
Content preview from IT用語図鑑 ビジネスで使える厳選キーワード256
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254
関連用語
用語に関連する話
用語の使用例
負荷分散
複数の機器で処理を分担
複数のサーバーなど、同じ役割を持つ複数の機器の間で処理を分散することで、1 台だ
けに大きな負荷がかかる状況を避けることを負荷分散と言う。また、負荷分散を行うため
の機器を負荷分散装置（ロードバランサ）と言う。負荷分散装置を使うことで、利用者は
1 台 のサーバーにアクセスしているように見えても、自動的に複数に振り分けられる。
「大量にアクセスがあるサーバーだと負荷分散が必須だね。」
CDNの使用
Web サイトや画像、動画を配信す
る場合には、自社で負荷分散する
よりもCDN と呼ばれるサーバー
にアップロードする方法が多く
使われている。
垂直分散との違い
負荷分散では同じ役割のコン
ピュータを複数で分散するた
め水平分散と言われるが、コン
ピュータを役割ごとに複数用意
することを垂直分散と言う。
分散と集中の歴史
災害が起きるリスクや負荷を考
えると、複数か所に分散すると安
心だが、管理面では集中の方が楽
であり、歴史を振り返ると交互に
繰り返しているように思える。
Keyword
229
▶
ふ か ぶ んさん
スケールアウトとスケールアップ
……P91
CDN
……P176
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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.