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NEW QUESTION: 1
ある会社には、それぞれが約5MBのサイズの多数のファイルを生成するアプリケーションがあります。ファイルはAmazonS3に保存されます。会社の方針では、ファイルを削除する前に4年間保存する必要があります。ファイルには複製が容易ではない重要なビジネスデータが含まれているため、すぐにアクセスできることが常に必要です。ファイルは、オブジェクト作成の最初の30日間に頻繁にアクセスされますが、最初の30日以降にアクセスされることはめったにありません。
どのストレージソリューションが最も費用効果が高いですか？
A. S3バケットライフサイクルポリシーを作成して、オブジェクトの作成から30日後にファイルをS3StandardからS3Standard-Infrequent Access（S3 Standard-IA）に移動します。オブジェクト作成から4年後にファイルを削除します。
B. S3バケットライフサイクルポリシーを作成して、オブジェクトの作成から30日後にファイルをS3StandardからS3Glacierに移動します。オブジェクト作成から4年後にファイルを削除します。
C. S3バケットライフサイクルポリシーを作成して、ファイルをS3StandardからS3One Zone-Infrequent Access（S3 One Zone-IA）にオブジェクトの作成から30日後に移動します。オブジェクト作成から4年後にファイルを削除します。
D. S3バケットライフサイクルポリシーを作成して、オブジェクトの作成から30日後にファイルをS3StandardからS3Standard-Infrequent Access（S3 Standard-IA）に移動します。オブジェクトの作成から4年後にファイルをS3Glacierに移動します。
Answer: A
NEW QUESTION: 2
会社には、さまざまな部門のための複数のAWSアカウントがあります。ある部門が、Amazon S3バケットを他のすべての部門と共有したいと考えています。
どのソリューションが最小限の労力を必要としますか？
A. バケットのクロスアカウントS3レプリケーションを有効にします
B. 部門ごとに1AMユーザーを作成し、読み取り専用のIAMポリシーを構成します
C. S3バケットポリシーを設定して、他の部門へのクロスアカウントアクセスを許可します
D. バケットへの事前署名済みURLを作成し、それを他の部門と共有します
Answer: B
NEW QUESTION: 3
A. Option C
B. Option B
C. Option A
D. Option D
Answer: C
NEW QUESTION: 4
データベース環境のパフォーマンスを分析しています。
データベースにアクセスするアプリケーションは、長期間にわたってロックされています。 あなたはダーティー、反復不能、ファントムリードなどの孤立現象を経験しています。
特定のトランザクション分離レベルがデータの並行性と一貫性に与える影響を特定する必要があります。
各トランザクション分離レベルの一貫性と並行性への影響は何ですか？ 答えるには、適切な隔離レベルを正しい場所にドラッグします。 各分離レベルは、1回、複数回、またはまったく使用しないことができます。 コンテンツを表示するには、ペイン間の分割バーをドラッグするか、スクロールする必要があります。
Answer:
Explanation:
Explanation
Read Uncommitted (aka dirty read): A transaction T1executing under this isolation level can access data changed by concurrent transaction(s).
Pros:No read locks needed to read data (i.e. no reader/writer blocking). Note, T1 still takes transaction duration locks for any data modified.
Cons: Data is not guaranteed to be transactionally consistent.
Read Committed: A transaction T1 executing under this isolation level can only access committed data.
Pros: Good compromise between concurrency and consistency.
Cons: Locking and blocking. The data can change when accessed multiple times within the same transaction.
Repeatable Read: A transaction T1 executing under this isolation level can only access committed data with an additional guarantee that any data read cannot change (i.e. it is repeatable) for the duration of the transaction.
Pros: Higher data consistency.
Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency. It does not protect against phantom rows.
Serializable: A transaction T1 executing under this isolation level provides the highest data consistency including elimination of phantoms but at the cost of reduced concurrency. It prevents phantoms by taking a range lock or table level lock if range lock can't be acquired (i.e. no index on the predicate column) for the duration of the transaction.
Pros: Full data consistency including phantom protection.
Cons: Locking and blocking. The S locks are held for the duration of the transaction that can lower the concurrency.
References:
https://blogs.msdn.microsoft.com/sqlcat/2011/02/20/concurrency-series-basics-of-transaction-isolation-levels/