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NEW QUESTION: 1
You are evaluating the performance of a database environment.
You must avoid unnecessary locks and ensure that lost updates do not occur.
You need to choose the transaction isolation level for each data scenario.
Which isolation level should you use for each scenario? To answer, drag the appropriate isolation levels to the correct scenarios. Each isolation 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

Box 1: Readcommitted
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.
Box 2: Read Uncommitted
Read Uncommitted (aka dirty read): A transaction T1 executing 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.
Box 3: Serializable
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
Which of the following administrative policy controls requires individuals or organizations to be engaged in good business practices relative to the organization's industry?
A. Separation of duties
B. Segregation of duties
C. Due care
D. Need to Know
Answer: C

NEW QUESTION: 3
Study the Rule base and Client Authentication Action properties screen.


After being authenticated by the Security Gateways, a user starts a HTTP connection to a
Web site. What happens when the user tries to FTP to another site using the command line? The:
A. FTP connection is dropped by Rule 2.
B. user is prompted to authenticate from that FTP site only, and does not need to enter his username and password for Client Authentication
C. FTP data connection is dropped after the user is authenticated successfully.
D. user is prompted for authentication by the Security Gateways again.
Answer: B

NEW QUESTION: 4
Your customer is struggling to make their data center, which is already 70% virtualized, more automated and sofware-defined. IT resists further virtualization due to the special requirements of some workloads.
Is this an approach that you should recommend to decision makers for meeting their goals?
Use OneView's templates and Unified API to treat both virtual and physical infrastructure as fluid resource pools.
A. Yes
B. No
Answer: B