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NEW QUESTION: 1
Deductibles for dental insurance plans are _________
A. Either A or B
B. Not negotiable (fixed)
C. Negligible
D. Non-existent
Answer: A
NEW QUESTION: 2
You have several real-time applications that constantly update data in a database. The applications run more than 400 transactions per second that insert and update new metrics from sensors.
A new web dashboard is released to present the data from the sensors. Engineers report that the applications take longer than expected to commit updates.
You need to change the dashboard queries to improve concurrency and to support reading uncommitted data.
What should you do?
A. Execute the ALTER TABLE T1 SET (LOCK_ESCALATION = AUTO);statement.
B. Set SET XACT_ABORTto ON.
C. Set SET ALLOW_SNAPSHOT_ISOLATIONto ON.
D. Use the max worker threadsoption.
E. Use the NOLOCKoption.
F. Use the OUTPUTparameters.
G. Execute the DBCC UPDATEUSAGEstatement.
H. Use a table-valued parameter.
Answer: E
Explanation:
Explanation/Reference:
Explanation:
The NOLOCK hint allows SQL to read data from tables by ignoring any locks and therefore not being blocked by other processes.
This can improve query performance, but also introduces the possibility of dirty reads.
Incorrect Answers:
F: When SET XACT_ABORT is ON, if a Transact-SQL statement raises a run-time error, the entire transaction is terminated and rolled back.
G: DISABLE, not AUTO, would be better.
There are two more lock escalation modes: AUTO and DISABLE.
The AUTO mode enables lock escalation for partitioned tables only for the locked partition. For non- partitioned tables it works like TABLE.
The DISABLE mode removes the lock escalation capability for the table and that is important when concurrency issues are more important than memory needs for specific tables.
Note: SQL Server's locking mechanism uses memory resources to maintain locks. In situations where the number of row or page locks increases to a level that decreases the server's memory resources to a minimal level, SQL Server's locking strategy converts these locks to entire table locks, thus freeing memory held by the many single row or page locks to one table lock. This process is called lock escalation, which frees memory, but reduces table concurrency.
References: https://www.mssqltips.com/sqlservertip/2470/understanding-the-sql-server-nolock-hint/
NEW QUESTION: 3
Which of the following connectors are MOST commonly used on a POTS line?
A. RJ-11
B. MTRJ
C. DB-9
D. RJ-45
Answer: A
Explanation:
The six-position plug and jack commonly used for telephone line connections may be used for RJ11, RJ14 or even RJ25, all of which are actually names of interface standards that use this physical connector. The RJ11 standard dictates a 2-wire connection, while RJ14 uses a 4-wire configuration, and RJ25 uses all six wires. The RJ abbreviations, though, only pertain to the wiring of the jack (hence the name "registered jack"); it is commonplace but not strictly correct to refer to an unwired plug connector by any of these names. Typically you'll find the RJ-11 and RJ-14 on your Plain Old Telephone Service (POTS)
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