August 2024
Intermediate to advanced
392 pages
10h 4m
Japanese
Content preview from 達人に学ぶDB設計徹底指南書 第2版
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2-3
前節まででストレージ内部というミクロレベルにおける冗長構成としてRAID
の概念を学びました。次はより高いレベル（データベースサーバー、あるいは仮
想環境であればインスタンス）での冗長化と可用性の担保について学びます。
その時に利用されるのがという技術です。OracleやMySQL、
PostgreSQL など、主要なDBMSであれば、すべてのDBMSがこの機能を持ってい
ます
。レプリケーションは、後にクラウドでの可用性向上の際にも登場する
重要な技術なので、本節でしっかり学習しましょう。
レプリケーションとは、現用系（Active やマスタ、プライマリとも呼ばれます）
と待機系(Standby、スレーブ、セカンダリとも呼ばれます) からなる複数のデータ
ベースを用意し、現用系から待機系へ更新データの情報を送信してデータベース
のレベルでデータが同じになるようにする技術です。これによって、現用系のデー
タベースに障害があった場合も待機系で処理を継続できるようにしたり（可用性向
上 ）、 を増やすことで読み込みスループットを向上させたりします
（性能向上）。レプリケーションによってデータが反映される先の待機系のデータ
ベースを特に（複製）と呼ぶことがあります。
...
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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.