What is the process of decomposing a relation into smaller relations that meet normalization requirements known as?

  • Abstraction
  • Aggregation
  • Decomposition
  • Integration
The process of decomposing a relation into smaller relations that meet normalization requirements is known as decomposition. It involves breaking down a table into smaller, more manageable tables to achieve higher normal forms and improve data integrity.

One advantage of using a Key-Value Store is its ability to handle _______ workloads efficiently.

  • Complex-query
  • Mixed
  • Read-intensive
  • Write-intensive
One advantage of using a Key-Value Store is its ability to handle write-intensive workloads efficiently. Key-Value Stores are optimized for simple read and write operations, making them well-suited for scenarios where write operations are frequent and need to be executed quickly.

How does data storage occur in column-family stores?

  • Column-wise storage
  • Database-wise storage
  • Row-wise storage
  • Table-wise storage
In column-family stores, data storage occurs in a column-wise manner. Unlike traditional row-wise storage, where entire rows are stored together, column-family stores organize data by columns. This facilitates efficient retrieval of specific columnar data, making it suitable for scenarios where selective data retrieval is common.

Scenario: A healthcare organization needs to consolidate patient records from various departments for analytical purposes while ensuring data privacy and compliance. Which solution, Data Warehouse or Data Marts, would better address their requirements, and what considerations would you take into account?

  • Both Data Warehouse and Data Marts
  • Data Marts
  • Data Warehouse
  • Neither Data Warehouse nor Data Marts
For a healthcare organization consolidating patient records, a Data Warehouse is more suitable. It allows integration of data from diverse sources while ensuring data privacy and compliance. A Data Warehouse's centralized nature facilitates comprehensive analytics, providing insights across departments while maintaining necessary controls.

One advantage of MySQL Workbench over Microsoft Visio is its built-in support for _______.

  • Entity-Relationship Diagrams (ERDs)
  • Flowcharts
  • Gantt charts
  • UML Diagrams
MySQL Workbench has a built-in support for creating Entity-Relationship Diagrams (ERDs), which is an advantage over Microsoft Visio for database design purposes. ERDs are essential for visualizing and planning the relationships between entities in a database.

Dimension tables typically contain _______ data that provides context to the metrics in the fact table.

  • Categorical
  • Historical
  • Numerical
  • Predictive
Dimension tables typically contain categorical data that provides context to the metrics in the fact table. Categorical data helps in categorizing and organizing information, allowing for meaningful analysis and reporting. Dimension tables are linked to the fact table through keys, creating a relationship between descriptive information and measurable metrics.

Query optimization is typically more challenging in a _______ Schema due to its normalized structure.

  • Galaxy
  • Hybrid
  • Snowflake
  • Star
Query optimization is more challenging in a Snowflake Schema due to its normalized structure. The need for multiple joins between normalized tables can impact query performance compared to a Star Schema, where denormalization simplifies queries but may introduce redundancy.

_______ is a technique used to resolve conflicts in collaborative data modeling.

  • Conflict resolution
  • Rollback
  • Rollforward
  • Snapshotting
Conflict resolution is a technique employed in collaborative data modeling to address conflicts that may arise when multiple users make changes to the same model simultaneously. It involves strategies such as merging changes, prioritizing modifications, or notifying users of conflicts.

The use of version control systems is crucial in managing changes during both Forward and Reverse Engineering to ensure _______.

  • Consistency
  • Performance
  • Scalability
  • Security
Version control systems, such as Git, are crucial in managing changes during both Forward and Reverse Engineering to ensure consistency. They track modifications, provide a history of changes, and enable collaboration among team members, ensuring a reliable and traceable development process.

What is the purpose of a check constraint in a database schema?

  • Defines relationships between tables
  • Enforces unique values in a column
  • Sets default values for columns
  • Validates data against a specified condition
A check constraint in a database schema is used to validate data against a specified condition. It ensures that values in a column meet specific criteria, providing a way to control and maintain data integrity.