Scenario: A financial institution maintains a database for tracking transactions, accounts, and customers. They need to generate detailed financial reports quickly. How could denormalization be used to optimize reporting queries?

  • Create indexed views for financial reports
  • Implement partitioning for better data organization
  • Introduce redundancy by merging tables to simplify queries
  • Normalize tables to reduce redundancy
In this scenario, denormalization can be applied by creating indexed views for financial reports. This involves introducing redundancy strategically to optimize reporting queries, as the indexed views store precomputed results for faster retrieval.

In a graph database, what does a node represent?

  • A data attribute
  • A record in a table
  • A table in the database
  • An entity or data point
In a graph database, a node represents an entity or data point. Nodes are used to store and represent individual entities, and relationships between nodes express the connections or associations between these entities. This allows for a flexible and efficient representation of complex relationships in data.

In specialization, what does the term "subtypes" refer to?

  • Generalized entities
  • Shared attributes
  • Specialized entities
  • Unique identifiers
In specialization, "subtypes" refer to the specialized entities that are derived from a more generalized entity. These subtypes inherit the attributes and relationships of the parent entity but may also have unique characteristics specific to their subtype.

What is the fundamental data structure used in a Key-Value Store?

  • Array
  • Hash Table
  • Linked List
  • Tree
The fundamental data structure used in a Key-Value Store is a Hash Table. Hash Tables provide efficient key-based access to values by mapping keys to specific locations in the table. This allows for quick retrieval of values based on their associated keys.

What does an entity represent in an Entity-Relationship Diagram (ERD)?

  • A database attribute
  • A foreign key
  • A real-world object
  • A relationship between tables
In an ERD, an entity represents a real-world object or concept, such as a person, place, thing, or event, about which data is stored in a database. Entities are typically nouns and serve as the foundation for the structure of the database. Entities are depicted as rectangles in an ERD.

Reverse Engineering helps in understanding the structure and relationships within an existing database schema, facilitating _______.

  • Code optimization
  • Database documentation
  • Schema modification
  • System integration
Reverse Engineering helps in understanding the existing database schema by documenting its structure and relationships. This facilitates database documentation, making it easier for developers and database administrators to comprehend and work with the database.

_______ integrity ensures that primary key values are unique and not null.

  • Data
  • Entity
  • Primary
  • Referential
Detailed Primary integrity ensures that primary key values are unique and not null. The primary key is a crucial component in a relational database as it uniquely identifies each record in a table, preventing duplication and ensuring data reliability.

What is the advantage of using compression techniques in data storage systems?

  • Faster data transmission
  • Improved data durability
  • Increased data redundancy
  • Reduced storage space requirements
Using compression techniques in data storage systems provides the advantage of reduced storage space requirements. This leads to more efficient use of storage resources, cost savings, and improved overall system performance. Additionally, it can contribute to faster data transmission, especially in scenarios involving data transfer over networks.

In a superclass-subclass relationship, a _______ is a specialized version of a more general entity.

  • Subclass
  • Subtype
  • Superclass
  • Superset
In a superclass-subclass relationship, a Subtype is a specialized version of a more general entity, known as the superclass. This modeling concept allows for creating a hierarchy within entities, emphasizing shared and distinct attributes.

In a database context, what does the acronym ACID stand for?

  • Access, Communication, Isolation, Data
  • Association, Concurrency, Integration, Dependability
  • Atomicity, Consistency, Isolation, Durability
  • Authentication, Cohesion, Isolation, Decentralization
ACID stands for Atomicity, Consistency, Isolation, and Durability. These are the four key properties that guarantee the reliability of transactions in a database system.