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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表わす言葉がありますが、これはLinux ／ Apache ／ ／ PHPの頭文字で
す ）。
もちろん、レプリカを作って運用するにもコストがかかるので、タダでパフォー
マンスや可用性向上が可能なわけではありません。はじめにでも述べたように、あ
らゆる設計にトレードオフはついて回るのです。フリーランチはここにもありませ
ん。
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本節で見たように、レプリケーションは、データを複数の箇所に分散して持つ
冗長構成による可用性向上を目的としています。その利点は、現用系のデータセ
ンターが被災するような大規模災害に襲われたとしても、遠隔地の待機系を使っ
て素早くサービス復旧ができるという機動性の高さ、すなわち災害対策の指標で
あるRPO（Recovery Point Objective：目標復旧地点）とRTO（Recovery Time
Objective：目標復旧時間）が向上することにあります。RPOと RTO はどちらもゼ
ロに近づくほど理想的です。一方、待機系のデータが常に最新に上書きされていく
という特性上、。そうした
タイプのデータ復旧を実現するには2-6 節で見る ...
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