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NEW QUESTION: 1
多くの日常的なシステム管理者のバックアップおよびリカバリアクティビティを自動化するように依頼されました。現在の計画では、AWSが管理するソリューションを可能な限り活用し、残りをAWS CLIとスクリプトで自動化することです。
スクリプトを使用すると、どのタスクが最適ですか。
A. 未使用または十分に活用されていないEC2インスタンスを自動的に検出して停止します
B. 自動スケーリングされたEC2インスタンスをAmazon Elastic Load Balancerに自動的に追加します
C. スナップショットの月次ローテーションで毎日のRDSスナップショットを作成する
D. スナップショットの月次ローテーションで毎日EBSスナップショットを作成する
Answer: D

NEW QUESTION: 2
A 55-year-old dental nurse was referred for bone densitometry after sustaining a non-displaced fracture of the femur after falling down a step. She had experienced no other fractures. Her only medical problem was long-standing anaemia of unknown cause. The only family history was of persistent dental abscesses affecting her father. She had three children who were well. She was taking no medication.
Examination was normal.
Investigations:
haemoglobin102 g/L (115-165)
MCV85 fL (80-96)
white cell count6.0 ? 109/L (4.0-11.0)
platelet count245 ? 109/L (150-400)
erythrocyte sedimentation rate25 mm/1st h (<30)
serum creatinine85 umol/L (60-110)
serum corrected calcium2.40 mmol/L (2.20-2.60)
serum alkaline phosphatase56 U/L (45-105)
DXA scan spine (L2-L4)T score +5.8
DXA scan total hipT score +5.4
What is the most likely diagnosis?
A. fluorosis
B. myelodysplasia
C. high bone mass phenotype
D. Paget's disease
E. osteopetrosis
Answer: E

NEW QUESTION: 3
You are analyzing the performance of a database environment.
Applications that access the database are experiencing locks that are held for a large amount of time. You are experiencing isolation phenomena such as dirty, nonrepeatable and phantom reads.
You need to identify the impact of specific transaction isolation levels on the concurrency and consistency of data.
What are the consistency and concurrency implications of each transaction isolation level? To answer, drag the appropriate isolation levels to the correct locations. Each isolation level may be used once, more than once, or not at all. You may need to drag the split bar between panes or scroll to view content.

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/