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NEW QUESTION: 1
Assuming that the following snippet has been successfully executed, which of the equations are False? (Select two answers)

A. b[0] - 1 == a[0]
B. a[0] = b[0]
C. len(a) == len(b)
D. a[0] - 1 == b[0]
Answer: C,D
Explanation:

NEW QUESTION: 2


Answer:
Explanation:

Explanation

References:
https://docs.microsoft.com/en-us/windows-server/identity/ad-ds/deploy/demoting-domain-controllers-and-domai

NEW QUESTION: 3
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/