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NEW QUESTION: 1
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/
NEW QUESTION: 2
A. BladeCenter H
B. Rack optimized
C. Tower
D. PureSystems
Answer: C
NEW QUESTION: 3
Poor Web application performance contributes to which four of these issues for businesses? (Choose four.)
A. Loss of revenue
B. Identity theft
C. Loss of users
D. Increased support calls
E. DDoS attacks
F. A Web site that goes unused
Answer: A,C,D,F
NEW QUESTION: 4
What is the maximum amount of RAM a single application instance on SAP Cloud Platform Cloud
Foundry can use?
Response:
A. 4 GB
B. 16 GB
C. 8 GB
D. 2 GB
Answer: D
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