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NEW QUESTION: 1
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/
NEW QUESTION: 2
Which three Statements describe the capabilities and functions of the chkconfig command in Oracle Linux?
A. It can be used to list all services and their run levels-
B. It can be used to specify the run levels for which a service is to be activated.
C. It can be used to check the status of a service to see if it is running.
D. It can be used to add a service.
E. It can be used to change the state of a service.
Answer: A,B,D
NEW QUESTION: 3
On wireless networks, a SSID is used to identify the network. Why are SSID not considered to be a good security mechanism to protect a wireless network?
A. The SSID is transmitted in clear text
B. The SSID is only 32 bits in length
C. The SSID is to identify a station not a network
D. The SSID is the same as the MAC address for all vendors
Answer: A
Explanation:
The use of SSIDs is a fairly weak form of security, because most access points broadcast the SSID, in clear text, multiple times per second within the body of each beacon frame. A hacker can easily use an 802.11 analysis tool (e.g., AirMagnet, Netstumbler, or AiroPeek) to identify the SSID.
NEW QUESTION: 4
You have a database for a banking system. The database has two tables named tblDepositAcct and tblLoanAcct that store deposit and loan accounts, respectively. Both tables contain the following columns:
You need to determine the total number of customers who have only deposit accounts.
Which Transact-SQL statement should you run?
A. Option G
B. Option D
C. Option E
D. Option C
E. Option A
F. Option H
G. Option B
H. Option F
Answer: H
Explanation:
Explanation
References:
https://docs.microsoft.com/en-us/sql/t-sql/language-elements/set-operators-except-and-intersect-transact-sql?view
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