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NEW QUESTION: 1
You are the business analyst for a smaller project where there are few requirements. Management would still like you to create a method to trace the few requirements for this project.
What type of matrix would be best in this instance?
A. RACI matrix
B. Coverage matrix
C. Roles and responsibility matrix
D. Requirements trace matrix
Answer: B
NEW QUESTION: 2
アプリケーションは、データの永続化のために、2つのAZとマルチAZ RDSインスタンスに展開されたWeb /アプリケーションサーバーのAuto Scalingグループの前でELBを使用しています。多くの場合、データベースのCPUは80％を超える使用率であり、データベースのI / O操作の90％は読み取りです。パフォーマンスを改善するために、最近、頻繁なDBクエリ結果をキャッシュするために単一ノードのMemcached ElastiCacheクラスターを追加しました。今後数週間で、全体的なワークロードは30％増加すると予想されます。
予想される追加の負荷でアプリケーションの高可用性を維持するために、アーキテクチャを変更する必要がありますか？どうして？
A. はい、RDS DBマスターインスタンスと同じAZに2つのノードを持つMemcached ElastiCacheクラスターをデプロイして、1つのキャッシュノードに障害が発生した場合の負荷を処理する必要があります。
B. いいえ、キャッシュノードに障害が発生した場合、可用性に影響を与えることなく、常に同じデータをDBから取得できます。
C. はい。キャッシュノードに障害が発生した場合、RDSインスタンスはロードを処理できないため、異なるAZに2つのMemcached ElastiCacheクラスターをデプロイする必要があります。
D. いいえ。キャッシュノードに障害が発生した場合、自動化されたElastiCacheノードリカバリ機能により、可用性への影響が防止されます。
Answer: C
Explanation:
単一ノードのMemcached ElastiCacheクラスターの障害は、完全な障害にすぎません。 （AWSは失敗したノードを自動的に回復しますが、クラスターには他のノードはありません）
http://docs.aws.amazon.com/AmazonElastiCache/latest/UserGuide/BestPractices.htmlノード障害の軽減ノード障害の影響を軽減するには、キャッシュされたデータをより多くのノードに分散します。 Memcachedはレプリケーションをサポートしていないため、ノード障害が発生すると、クラスターからのデータ損失が常に発生します。
Memcachedクラスターを作成する場合、特別な要求により、1〜20以上のノードでクラスターを作成できます。より多くのノードにデータを分割すると、ノードに障害が発生しても失われるデータが少なくなります。たとえば、10個のノードにデータを分割すると、単一のノードにキャッシュされたデータの約10％が保存されます。この場合、ノード障害はおよそ失われます
交換ノードが作成およびプロビジョニングされるときに交換する必要があるキャッシュの10％。
アベイラビリティーゾーンの障害の軽減
アベイラビリティーゾーンの障害の影響を軽減するには、できるだけ多くのアベイラビリティーゾーンにノードを配置します。万一、AZに障害が発生した場合、そのAZにキャッシュされたデータのみが失われ、他のAZにキャッシュされたデータは失われません。
NEW QUESTION: 3
作成され、実行され、最終的に閉じた状態に移行するものを最もよく表している用語はどれですか。
A. workflow
B. report
C. event
D. task
Answer: D
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