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CompTIA DataSys+ Certification Exam Sample Questions (Q100-Q105):

NEW QUESTION # 100
A database administrator realizes that certain data was not captured correctly when it was imported. Which of the following commands should the administrator use to fix the issue?

A. ALTER TABLE
B. DROP TABLE
C. DELETE
D. UPDATE

Answer: D

Explanation:
The UPDATE command allows the administrator to modify existing records in a table to correct data that was not captured correctly during import.

NEW QUESTION # 101
Which of the following resources is the best way to lock rows in SQL Server?

A. TID
B. PID
C. RID
D. SID

Answer: C

Explanation:
The resource that is the best way to lock rows in SQL Server is RID. RID, or Row IDentifier, is an attribute that uniquely identifies each row in a heap table in SQL Server. A heap table is a table that does not have a clustered index, which means that the rows are not stored in any particular order. A RID consists of the file number, page number, and slot number of the row in the database. A RID can be used to lock rows in SQL Server to prevent concurrent access or modification by other transactions or users. A RID lock is a type of lock that locks a single row using its RID. A RID lock can be applied using the HOLDLOCK or XLOCK hints in a SELECT statement. The other options are either not related or not effective for this purpose. For example, TID, or Transaction IDentifier, is an attribute that uniquely identifies each transaction in a database; SID, or Security IDentifier, is an attribute that uniquely identifies each user or group in a Windows system; PID, or Process IDentifier, is an attribute that uniquely identifies each process in an operating system.

NEW QUESTION # 102
Which of the following types of RAID, if configured with the same number and type of disks, would provide the best write performance?

A. RAID 6
B. RAID 3
C. RAID 5
D. RAID 10

Answer: D

Explanation:
The type of RAID that would provide the best write performance if configured with the same number and type of disks is RAID 10. RAID 10, or RAID 1+0, is a type of RAID that combines mirroring and striping techniques to provide both redundancy and performance. Mirroring means that data is duplicated across two or more disks to provide fault tolerance and data protection.
Striping means that data is split into blocks and distributed across two or more disks to provide faster access and throughput. RAID 10 requires at least four disks and can tolerate the failure of up to half of the disks without losing data. RAID 10 provides the best write performance among the RAID types because it can write data in parallel to multiple disks without parity calculations or overhead. The other options are either different types of RAID or not related to RAID at all. For example, RAID 3 is a type of RAID that uses striping with a dedicated parity disk to provide redundancy and performance; RAID 5 is a type of RAID that uses striping with distributed parity to provide redundancy and performance; RAID 6 is a type of RAID that uses striping with double distributed parity to provide extra redundancy and performance.

NEW QUESTION # 103
A database administrator executed multiple transactions and needs to finish the operations.
Which of the following functions should the administrator use?

A. Commit
B. Rollback
C. Return
D. Save

Answer: A

Explanation:
The Commit function finalizes all changes made during the transactions, making them permanent in the database.

NEW QUESTION # 104
Which of the following is most likely to prevent tampering with server hardware that houses data?

A. Biometric locks
B. Strong password policy
C. Surveillance cameras
D. Network firewall

Answer: A

Explanation:
The option that is most likely to prevent tampering with server hardware that houses data is biometric locks.
Biometric locks are devices that use biological characteristics, such as fingerprints, facial recognition, iris scan, etc., to control access to a physical location or resource. Biometric locks help prevent tampering with server hardware that houses data by restricting unauthorized entry or theft of the hardware by intruders or attackers. Biometric locks also provide higher security and convenience than other types of locks, such as keys or passwords, which can be lost, stolen, or forgotten. The other options are either not related or not effective for this purpose. For example, a strong password policy is a set of rules or standards for creating and managing passwords for user accounts or systems; a network firewall is a device or software that controls the incoming and outgoing traffic on a network based on a set of rules or policies; surveillance cameras are devices that capture and record video footage of a physical location or resource. References: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.

NEW QUESTION # 105
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