June 2016
Beginner to intermediate
376 pages
8h 58m
Japanese
Content preview from データ分析によるネットワークセキュリティ
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4.3
どのストレージを使うべきか？
67
4.3
どのストレージを使うべきか？
ストレージアーキテクチャを選ぶときには、収集するデータの種類とそのデータを使う報告の種類
を検討する。主に決まった形式の報告を作成するのだろうか。あるいは、アナリストが大量の探索
的な問い合わせをするだろうか。
記録方式を選ぶときの判断の種類を表4-1にまとめた。判断は優先度順に列挙している。1が最善、
3が最悪、×は全く考慮しないことを意味する。記録選択に与える影響を説明するために、それぞれ
の選択肢について詳細に述べていく。
表4-1 データシステムに関する判断
状況 リレーショナル カラムナ キーストア
複数のディスクやホストにアクセスする 2 1 1
単一ホストにアクセスする 1 × ×
データがテラバイト未満 1 2 3
データが数テラバイト 2 1 1
行を更新する予定がある 1 × ×
行は決して更新しない 2 1 1
データが非構造化テキスト 2 3 1
データが構造を持つ 2 1 3
個々のレコードが小さい 2 1 3
個々のレコードが大きい 3 2 1
アナリストに開発スキルがある 1 1 1
アナリストに開発スキルがない 1 1 2
最初の判断は、ハードウェアの問題だ。カラムナデータベースやキーストアなどのビッグデータシ
ステムが性能上のメリットを発揮するのは、並列ノードで実行できる場合だけだ。その場合は並列
ノードが多ければ多いほどメリットがある。単一ホストや利用できるホストが 4 つ未満の場合には、
おそらく従来のデー
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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.