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NEW QUESTION: 1
A. Option A
B. Option D
C. Option C
D. Option E
E. Option B
Answer: B
NEW QUESTION: 2
Sie bewerten die Leistung einer Datenbankumgebung.
Sie müssen unnötige Sperren vermeiden und sicherstellen, dass keine verlorenen Updates auftreten.
Sie müssen die Transaktionsisolationsstufe für jedes Datenszenario auswählen.
Welche Isolationsstufe sollten Sie für jedes Szenario verwenden? Ziehen Sie zur Beantwortung die entsprechenden Isolationsstufen auf die richtigen Szenarien. Jede Isolierung 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
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: 3
Which of the following fields is stored with the events in the index?
A. sourcelp
B. user
C. location
D. source
Answer: C
NEW QUESTION: 4
A. Option A
B. Option D
C. Option C
D. Option B
Answer: A
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