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NEW QUESTION: 1
Sie analysieren die Leistung einer Datenbankumgebung.
Bei Anwendungen, die auf die Datenbank zugreifen, treten Sperren auf, die über einen längeren Zeitraum hinweg bestehen. Es treten Isolationsphänomene wie schmutzige, nicht wiederholbare und Phantom-Lesevorgänge auf.
Sie müssen die Auswirkungen bestimmter Transaktionsisolationsstufen auf die Parallelität und Konsistenz von Daten ermitteln.
Welche Auswirkungen haben Konsistenz und Parallelität auf die einzelnen Transaktionsisolationsstufen? Ziehen Sie zum Beantworten die entsprechenden Isolationsstufen an die richtigen Positionen. Jede Isolationsstufe kann einmal, mehrmals oder überhaupt nicht verwendet werden. Möglicherweise müssen Sie die geteilte Leiste zwischen den Fenstern ziehen oder einen Bildlauf durchführen, um den Inhalt anzuzeigen.

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
What is the 2-wire analog connection between residential telephones and the telephone company's nearest exchange called?
A. CO switch
B. T1 line
C. Local loop
D. ISDN service
Answer: C

NEW QUESTION: 3
A project is implemented using a predictive approach. Unfortunately, a lot of change requests (CR) have been raised. A project manager (PM), who should approve each change request, is overworked.
What could the business analyst (BA) propose to make things better?
A. Decline CRs because of the approach
B. Approve the CRs independently for the PM
C. Revisit the Business Analysis Governance approach
D. Transfer responsibility from the PM to a project's sponsor
Answer: C

NEW QUESTION: 4
Which activity is associated with the wireless technology assessment service component? Select exactly 1 answer(s) from the following:
A. Execute Test Cases
B. Perform Infrastructure Audit
C. Develop Escalation Plan
D. Develop Project Management
Answer: B
Explanation:
Explanation