DS0-001資格試験、DS0-001日本語対策問題集、CompTIA DataSys+ Certification Exam試験問題
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CompTIA DS0-001 認定試験の出題範囲:
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DS0-001試験の準備方法|真実的なDS0-001 PDF問題サンプル試験|効率的なCompTIA DataSys+ Certification Exam過去問無料
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CompTIA DataSys+ Certification Exam 認定 DS0-001 試験問題 (Q90-Q95):
質問 # 90
Which of the following describes a scenario in which a database administrator would use a relational database rather than a non-relational database?
- A. An organization requires data encryption.
- B. An organization wants to process complex data sets.
- C. An organization wants to maintain consistency among the data in the database.
- D. An organization wants to store a large number of videos, photos, and documents.
正解:C
解説:
A scenario in which a database administrator would use a relational database rather than a non-relational database is when an organization wants to maintain consistency among the data in the database. A relational database is a type of database that organizes data into tables with predefined columns and rows, and enforces rules and constraints to ensure data integrity and accuracy. A relational database also supports transactions, which are sets of operations that must be executed as a whole or not at all, to prevent data corruption or inconsistency. The other options are either not exclusive to relational databases or not relevant to the choice of database type. For example, data encryption can be applied to both relational and non-relational databases, processing complex data sets may require specialized tools or techniques that are not dependent on the database type, and storing a large number of videos, photos, and documents may be better suited for a non- relational database that can handle unstructured or semi-structured data. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.1 Given a scenario, identify and apply database structure types.
質問 # 91
Which of the following is a potential issue raised by enterprise database users?
- A. The need to manually transfer records to paper
- B. The need for concurrent access and multiuser updates
- C. The need to manage long transactions
- D. The need for multiple views or windows into the same database
正解:B
解説:
A potential issue raised by enterprise database users is the need for concurrent access and multiuser updates.
Concurrent access means that multiple users can access the same data at the same time, while multiuser updates mean that multiple users can modify the same data at the same time. These features are essential for enterprise database users who need to share and collaborate on data in real time. However, they also pose challenges such as maintaining data consistency, preventing conflicts or errors, and ensuring transaction isolation and durability. The other options are either not issues or not specific to enterprise database users. For example, the need for multiple views or windows into the same database may be a preference or a convenience, but not an issue; the need to manage long transactions may be a challenge for any database user, not just enterprise ones; the need to manually transfer records to paper may be an outdated or inefficient practice, but not an issue. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective 1.3 Given a scenario, identify common database issues.
質問 # 92
Which of the following is a characteristic of all non-relational databases?
- A. Columns with the same data type
- B. Tabular schema
- C. Logical record groupings
- D. Unstructured data
正解:D
解説:
The characteristic of all non-relational databases is unstructured data. Unstructured data is data that does not have a predefined or fixed format, schema, or structure. Unstructured data can include various types of data, such as text, images, audio, video, etc. Non-relational databases, also known as NoSQL databases, are databases that store and manage unstructured data using different models, such as key-value, document, graph, columnar, etc. Non-relational databases are suitable for handling large volumes, variety, and velocity of data that do not fit well in the relational model. The other options are either characteristics of relational databases or not related to database types at all. For example, columns with the same data type, logical record groupings, and tabular schema are characteristics of relational databases, which are databases that store and manage structured data using tables, rows, columns, and constraints.
質問 # 93
Which of the following transaction isolation levels allows dirty reads?
- A. Repeatable read
- B. Serializable
- C. Read committed
- D. Snapshot
- E. Read uncommitted
正解:E
解説:
The Read Uncommitted isolation level allows dirty reads, meaning transactions can read data that has been modified but not yet committed by other transactions.
質問 # 94
Which of the following is used to hide data in a database so the data can only be read by a user who has a key?
- A. Data security
- B. Data protection
- C. Data encryption
- D. Data masking
正解:C
解説:
The option that is used to hide data in a database so the data can only be read by a user who has a key is data encryption. Data encryption is a process that transforms data into an unreadable or scrambled form using an algorithm and a key. Data encryption helps protect data from unauthorized access or modification by third parties, such as hackers, eavesdroppers, or interceptors. Data encryption also helps verify the identity and authenticity of the source and destination of the data using digital signatures or certificates. Data encryption can be applied to data at rest (stored in a database) or data in transit (transmitted over a network). To read encrypted data, a user needs to have the corresponding key to decrypt or restore the data to its original form. The other options are either different concepts or not related to hiding data at all. For example, data security is a broad term that encompasses various methods and techniques to protect data from threats or risks; data masking is a technique that replaces sensitive data with fictitious but realistic data to protect its confidentiality or compliance; data protection is a term that refers to the legal or ethical obligations to safeguard personal or sensitive data from misuse or harm. Reference: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
質問 # 95
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