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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3.2
ログファイルの内容
47
テンプレート型からカラムナ型への変換
テンプレート型テキストは解析できる。テンプレート型メッセージの種類は限られているの
で、カラムナフォーマットに変換できると考えられる。しかし、このようなシステムを作成す
るには、テキストを読み取り、個々のメッセージを解析してその結果をスキーマに格納する中
間アプリケーションを開発する必要がある。これは大変な開発タスクだが（さらに、新しいメッ
セージが追加されたら更新する必要があるが）、必要となるスペースを減らし、データの読み
やすさを向上させることもできる。
1. テキストフォーマットのあらゆるドキュメントから、セキュリティに最も関連のあるメッ
セージを特定して選択する。変換スクリプトは一連の正規表現で構成される。保持すべき
正規表現は少ないほうがよい。
2. それぞれのメッセージに含まれるパラメータを特定する。例として、下記のようなテンプ
レート型メッセージを考えてみよう
。
Antispam tool SPAMKILLER identifies email <12938@yahoo.com> as Spam
Antispam tool SPAMKILLER identifies email <12938@yahoo.com> as Commercial
Antispam tool SPAMKILLER identifies email <12938@yahoo.com> as Legitimate
これには、アンチスパムツールの ...
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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.