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| Section | Weight | Objectives |
|---|---|---|
| Database Support, Maintenance & Optimization | 20% | - Database Security (Users, Roles, Permissions) - Patch Management - Backup and Recovery Procedures - Query Optimization - Performance Monitoring - Index Management |
| Database Implementation | 22% | - Data Types and Constraints - Database Objects (Tables, Views, Indexes) - Stored Procedures and Functions - Triggers - Data Import/Export - SQL DDL Statements |
| Data Analytics & Engineering | 19% | - Reporting Concepts - Data Warehousing Concepts - ETL Processes - Data Quality - Data Governance - Data Visualization Basics |
| Database Fundamentals | 20% | - Database Design Principles - Data Normalization - Database Concepts and Architecture - CAP Theorem - ACID Properties - Data Models (Relational, NoSQL, etc.) |
| Database Deployment & Planning | 19% | - Replication Strategies - Disaster Recovery Planning - Capacity Planning - High Availability Architecture - Database Server Requirements - Database Clustering |
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NEW QUESTION # 25
A database administrator is migrating the information in a legacy table to a newer table. Both tables contain the same columns, and some of the data may overlap.
Which of the following SQL commands should the administrator use to ensure that records from the two tables are not duplicated?
Answer: D
Explanation:
The SQL command that the administrator should use to ensure that records from the two tables are not duplicated is option A. This command uses the UNION clause to combine the records from the legacy table and the newer table into a single result set. The UNION clause also eliminates any duplicate records that may exist in both tables, and sorts the result by default. The other options either do not produce the desired result or have syntax errors. For example, option B would join the records from the two tables based on a common column, but not remove any duplicates; option C would return only the records that are common to both tables, but not the ones that are unique to each table; option D would produce a Cartesian product of the records from the two tables, which would increase the number of duplicates.
NEW QUESTION # 26
Given the following customer table:
Which of the following ORM snippets would return the ID, state, and country of all customers with the newest customers appearing first?
Answer: C
Explanation:
The ORM snippet that would return the ID, state, and country of all customers with the newest customers appearing first is option C. This snippet uses the select method to specify the columns to be returned, the order method to sort the results by ID in descending order, and the all method to fetch all the records. The other options either have syntax errors, use incorrect methods, or do not sort the results correctly. References: CompTIA DataSys+ Course Outline, Domain 1.0 Database Fundamentals, Objective
1.2 Given a scenario, execute database tasks using scripting and programming languages.
NEW QUESTION # 27
A programmer wants to configure a database to only allow read or write access when requests are coming from specific IP addresses. Which of the following can be used to configure IP addresses to allow access to the database?
Answer: C
Explanation:
The best option to configure IP addresses to allow access to the database is a firewall. A firewall is a network device or software that controls the incoming and outgoing traffic based on a set of rules or policies. A firewall can be used to filter the traffic by IP addresses, ports, protocols, or other criteria, and allow or deny access to the database accordingly. The other options are either not relevant or not sufficient for this task. For example, a static IP address is an IP address that does not change over time, but it does not determine the access to the database; a dynamic IP address is an IP address that changes periodically, but it does not control the traffic to the database; an IDNS is an Internet Domain Name System, which translates domain names into IP addresses, but it does not regulate the access to the database. 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 # 28
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.
NEW QUESTION # 29
A database administrator would like for users to be able to access resources remotely from home. Which of the following best describes how the administrator can enable this access without compromising the security of the stored data?
Answer: B
NEW QUESTION # 30
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