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| Section | Weight | Objectives |
|---|---|---|
| Database Deployment | 16% | - Implementation and testing
|
| Data and Database Security | 23% | - Security controls
|
| Database Management and Maintenance | 25% | - Maintenance tasks
|
| Business Continuity | 12% | - Continuity planning
|
| Database Fundamentals | 24% | - Scripting and programming
|
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NEW QUESTION # 33
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?
Answer: D
NEW QUESTION # 34
A data scientist recently joined a company and needs to review the data before building models.
Which of the following tools can the data scientist use to find the most extensive details?
Answer: C
Explanation:
A data dictionary provides detailed metadata about data elements, including definitions, formats, and relationships, helping the data scientist understand the dataset comprehensively.
NEW QUESTION # 35
Which of the following statements is TRUNCATEan example of?
Answer: A
Explanation:
TRUNCATE is a Data Definition Language (DDL) statement because it modifies the structure of the table by quickly removing all rows without logging individual row deletions.
NEW QUESTION # 36
A new retail store employee needs to be able to authenticate to a database. Which of the following commands should a database administrator use for this task?
Answer: D
Explanation:
The command that the database administrator should use for this task is CREATE USER. The CREATE USER command is a SQL statement that creates a new user account in a database and assigns it a username and a password. The CREATE USER command also allows the database administrator to specify other options or attributes for the user account, such as default tablespace, quota, profile, role, etc. The CREATE USER command is the first step to enable a user to authenticate to a database. The other options are either invalid or not suitable for this task. For example, INSERT USER is not a valid SQL command; ALLOW USER is not a SQL command, but a keyword used in some database systems to grant permissions to users; ALTER USER is a SQL command that modifies an existing user account, but does not create a new one. Reference: CompTIA DataSys+ Course Outline, Domain 4.0 Data and Database Security, Objective 4.2 Given a scenario, implement security controls for databases.
NEW QUESTION # 37
A database administrator needs to aggregate data from multiple tables in a way that does not impact the original tables, and then provide this information to a department. Which of the following is the best way for the administrator to accomplish this task?
Answer: A
Explanation:
The best way for the administrator to accomplish this task is to create a materialized view. A materialized view is a type of view that stores the result of a query on one or more tables as a separate table in the database. A materialized view can aggregate data from multiple tables in a way that does not impact the original tables, and then provide this information to a department as a single source of truth. A materialized view also improves query performance and efficiency by reducing the need to recompute complex queries every time they are executed. The other options are either not suitable or not optimal for this task. For example, creating indexes on those tables may improve query performance on individual tables, but not on aggregated data; creating a new database may require additional resources and maintenance, and may introduce inconsistency or redundancy; creating a function may require additional coding and execution, and may not store the result as a separate table. References: CompTIA DataSys+ Course Outline, Domain 2.0 Database Deployment, Objective 2.2 Given a scenario, create database objects using scripting and programming languages.
NEW QUESTION # 38
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