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NEW QUESTION: 1
オークションWebサイトにより、ユーザーは収集可能なアイテムに入札できます。オークションルールでは、各入札は一度だけ、受け取った順序で処理される必要があります。現在の実装は、入札レコードをAmazon Kinesis Data Streamsに書き込むAmazon EC2ウェブサーバーのフリートに基づいています。単一のt2.largeインスタンスには、入札プロセッサを実行するcronジョブがあります。このジョブは、Kinesis Data Streamsから着信入札を読み取り、各入札を処理します。オークションサイトの人気は高まっていますが、ユーザーは一部の入札が登録されていないことに不満を持っています。
トラブルシューティングは、需要のピーク時に入札プロセッサが遅すぎることを示し、処理中にクラッシュしたり、処理中のレコードを追跡できなくなることがあります。
どのような変更により、入札処理の信頼性が向上しますか？
A. EC2インスタンスタイプをt2.largeからより大きな一般的なコンピューティングインスタンスタイプに切り替えます。 Kinesis Data StreamsのIncomingRecordsメトリックスに基づいて、入札プロセッサを実行しているEC2インスタンスの数をスケールアウトするAuto Scalingグループに入札プロセッサEC2インスタンスを配置します。
B. 入札をKinesis Data Streamsに送信するときに、Amazon Kinesis Producer Library（KPL）を使用するようにWebアプリケーションをリファクタリングします。入札プロセッサをリファクタリングして、Kinesis Data Streamsの各レコードを未読、処理、および処理済みとしてフラグを立てます。各入札処理の実行の開始時に、Kinesis Data Streamsで未処理のレコードをスキャンします。
C. 各受信入札をKinesis Data Streamsの代わりにAmazon SQS FIFOキューにポストするようにWebアプリケーションをリファクタリングします。入札プロセッサをリファクタリングして、SQSキューを継続的に作成します。最小および最大サイズが1のAuto Scalingグループに入札処理EC2インスタンスを配置します。
D. Kinesis Data Streamsの代わりに、受信した各入札をAmazon SNSトピックに投稿するようにWebアプリケーションをリファクタリングします。ユーザーが送信するとすぐに各入札を処理するAWS Lambda関数をトリガーするようにSNSトピックを設定します。
Answer: C
Explanation:
Explanation
FIFO is better in this case compared to Kinesis, as it guarantee the order of the bid. Min Max 1, is okay as the SQS will hold the queue in case of failure of the instance, till it come back again.
NEW QUESTION: 2
CORRECT TEXT
Given the following code, what condition prefixes should be placed before the statement to ensure that the reference is valid?
PUT SKIP LIST( '< !! SUBSTR(X,1 ,N) !!'>');
A. STRINGRANGE
B. SIZE
C. SUBSCRIPTRANGE
D. STRINGSIZE
Answer: A
NEW QUESTION: 3
Which of the following cloud deployment models allows a company to have full control over its IT infrastructure?
A. Private
B. Hybrid
C. Public
D. Cloud within a cloud
Answer: A
Explanation:
Reference:
https://www.sciencedirect.com/topics/computer-science/private-cloud
NEW QUESTION: 4
Employees from several companies use an application once a year during a specific 30-day period. The periods are different for each company. Traffic to the application spikes during these 30-day periods.
How can the application be designed to handle these traffic spikes?
A. Use an Amazon Route 53 latency routing policy to route traffic to an Amazon EC2 instance with the least lag time.
B. Use an Auto Scaling group to scale the number of EC2 instances to match the site traffic.
C. Use Amazon S3 to cache static elements of the website requests.
D. Use Amazon Cloud Front to serve static assets to decrease the load on the EC2 instances
Answer: B