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NEW QUESTION # 64
Which of the following is a characteristic of a multizone region in a disaster recovery policy?
Answer: D
Explanation:
A multizone region in disaster recovery involves distributing resources across three or more availability zones to ensure resilience and fault tolerance within a single geographic region.
NEW QUESTION # 65
Which of the following types of RAID, if configured with the same number and type of disks, would provide the best write performance?
Answer: A
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 # 66
Which of the following code snippets would allow a SQL injection?
var name;
Answer: D
Explanation:
This code directly concatenates user input into an SQL query string without validation or parameterization, making it vulnerable to SQL injection attacks.
NEW QUESTION # 67
Which of the following indexes stores records in a tabular format?
Answer: D
Explanation:
The index that stores records in a tabular format is columnstore. A columnstore index is a type of index that stores and compresses data by columns rather than by rows. A columnstore index can improve the performance and efficiency of queries that perform aggregations, calculations, or analysis on large amounts of data, such as data warehouse or business intelligence applications. A columnstore index can also reduce the storage space required for data by applying various compression techniques, such as dictionary encoding, run-length encoding, bit packing, etc. The other options are either different types of indexes or not related to indexes at all. For example, a non-clustered index is a type of index that stores the values of one or more columns in a sorted order along with pointers to the corresponding rows in the table; a unique index is a type of index that enforces uniqueness on one or more columns in a table; a secondary index is an alternative term for a non-clustered index. Reference: CompTIA DataSys+ Course Outline, Domain 3.0 Database Management and Maintenance, Objective 3.1 Given a scenario, perform common database maintenance tasks.
NEW QUESTION # 68
(Which of the following indexes stores records in a tabular format?)
Answer: D
Explanation:
The correct answer is A. Columnstore. According to CompTIA DataSys+, a columnstore index stores data in a column-oriented, tabular structure, where each column of a table is stored separately rather than storing entire rows together. This design is particularly optimized for analytical and reporting workloads, which commonly scan large datasets and perform aggregations on specific columns.
In a columnstore index, data is logically still represented in a table-like (tabular) format, but physically organized by columns instead of rows. This allows the database engine to read only the required columns for a query, significantly reducing disk I/O and improving query performance. DataSys+ highlights columnstore indexes as a best practice for data warehousing, business intelligence, and read-heavy analytical queries.
Option B, a non-clustered index, stores a separate index structure that contains indexed column values and pointers to the underlying table rows. While it improves lookup performance, it does not store data in a tabular columnar format. Option C, a unique index, is a constraint-based index that enforces uniqueness on column values but does not define how data is physically stored. Option D, a secondary index, is a general term for indexes that are not primary and does not specifically describe column-based tabular storage.
Sys+ emphasizes understanding different index types and their appropriate use cases. Columnstore indexes are distinct because they physically reorganize data by columns, compress data efficiently, and support high-performance analytics. This makes them especially effective in scenarios involving large datasets and complex queries.
Therefore, the index type that stores records in a tabular, column-oriented format is the columnstore index
, making option A the correct and fully verified answer aligned with CompTIA DataSys+ objectives.
NEW QUESTION # 69
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