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| Certification Vendor: | CompTIA |
|---|---|
| Exam Name: | CompTIA DataSys+ Certification Exam |
| Exam Number: | DS0-001 |
| Available Languages: | English, Japanese |
| Exam Duration: | 90 minutes |
| Certificate Validity Period: | 3 years |
| Passing Score: | 700 (on a scale of 100–900) |
| Exam Price: | $390 USD (approximate; may vary by region) |
| Related Certifications: | CompTIA Server+ CompTIA Data+ CompTIA Security+ |
| Exam Format: | Multiple-choice, Performance-based questions |
| Real Exam Qty: | Up to 90 questions |
| Recommended Training: | CompTIA CertMaster Learn DataSys+ Official DataSys+ Study Guide (DS0-001) |
| Exam Registration: | CompTIA Official Certification Page Pearson VUE Exam Registration |
| Sample Questions: | CompTIA DS0-001 Sample Questions |
| Exam Way: | Online proctored or in-person testing via Pearson VUE authorized test centers |
| Pre Condition: | No formal prerequisites; 2–3 years of experience in database administration is recommended. |
| Official Syllabus URL: | https://www.comptia.org/certifications/datasys |
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質問 # 104
As part of an integrity check, a database administrator is creating both the primary and secondary snapshots. The database administrator notices the primary replica is failing over to the secondary replica. Which of the following describes how this will affect the database?
正解：B
解説：
Failover from a primary to a secondary replica in a properly configured environment is designed to be seamless, maintaining database availability and integrity without impacting operations.
質問 # 105
Given the following value from a VARCHAR column that is used to store integer values:
12A
Which of the following is the best way for a DBA to increase the data quality for this column?
正解：B
質問 # 106
Which of the following NoSQL database types best categorizes MongoDB?
正解：C
解説：
The NoSQL database type that best categorizes MongoDB is document. Document databases are databases that store and manage data as documents, which are collections of fields and values in formats such as JSON (JavaScript Object Notation) or XML (Extensible Markup Language). Document databases do not use any schema or structure to organize data, but rather use identifiers or indexes to enable flexible and dynamic access to data based on fields or values.
Document databases are suitable for storing large amounts of complex or unstructured data that have variable attributes or nested structures. MongoDB is an example of a document database that uses JSON-like documents to store and query data. The other options are either different types of NoSQL databases or not related to NoSQL databases at all. For example, column- oriented databases are databases that store and manage data as columns rather than rows; graph databases are databases that store and manage data as nodes and edges that represent entities and relationships; key-value stores are databases that store and manage data as pairs of keys and values.
質問 # 107
Which of the following best describes a collection of data that shares the same properties or attributes?
正解：B
解説：
The option that best describes a collection of data that shares the same properties or attributes is entity set. An entity set is a term used in the entity-relationship (ER) model, which is a conceptual model for designing and representing databases. An entity set is a collection of entities that have the same type or characteristics, such as students, courses, products, etc. An entity is an object or thing that can be identified and distinguished from others, such as a specific student, course, product, etc. An entity set can have one or more attributes that describe the properties or features of the entities, such as name, age, price, etc. An entity set can also have one or more relationships with other entity sets that define how the entities are associated or connected, such as enrolled, taught by, purchased by, etc. The other options are either different terms or not related to the ER model at all. For example, relation set is a term used in the relational model, which is a logical model for implementing and manipulating databases; ER model is a term used to refer to the entity-relationship model itself; tuples are rows or records in a table or relation.
質問 # 108
A database professional is considering denormalizing a database. Which of the following documents should be used to analyze the database's structure?
正解：A
解説：
The document that should be used to analyze the database's structure is an ERD. An ERD, or Entity Relationship Diagram, is a graphical representation of the entities (tables), attributes (columns), and relationships (constraints) in a database. An ERD helps to visualize the structure and design of the database, as well as the dependencies and associations among the tables. An ERD can also help to evaluate the level of normalization of the database, which is a process that organizes data into tables and columns to reduce redundancy and improve consistency. By using an ERD, a database professional can consider denormalizing a database, which is a process that introduces some redundancy or duplication of data to improve performance or simplify queries.
The other options are either different types of documents or not related to the database's structure. For example, an SOP, or Standard Operating Procedure, is a document that describes the steps and procedures for performing a specific task or operation; a data dictionary is a document that describes the metadata (information about data) of a database; a UML diagram is a graphical representation of a software system or its components using the Unified Modeling Language (UML).
質問 # 109
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