An entity that inherits properties and relationships from another entity is known as a _______.
- Child entity
- Derived entity
- Linked entity
- Parent entity
An entity that inherits properties and relationships from another entity is known as a "Child entity" or "Subtype." It represents a more specialized category within a Generalization and Specialization hierarchy.
How does partition pruning contribute to query optimization in a partitioned database?
- Adds additional partitions to the query for parallel processing
- Eliminates irrelevant partitions from the query execution
- Merges multiple partitions into a single partition for improved query performance
- Randomly selects partitions for query execution
Partition pruning contributes to query optimization by eliminating irrelevant partitions from the query execution process. This means that the database engine can skip unnecessary partitions, reducing the amount of data to be processed and improving query performance. This is especially crucial in large partitioned databases.
How does conceptual schema design differ from logical schema design?
- Focuses on high-level business requirements
- Incorporates indexing strategies
- Involves the creation of tables and relationships
- Is concerned with optimizing database performance
Conceptual schema design concentrates on high-level business requirements, defining entities and relationships without delving into technical details. It's a blueprint for the overall structure, contrasting with logical schema design that involves table creation and relationship establishment.
How can database partitioning enhance performance tuning efforts?
- By improving memory allocation
- By increasing CPU usage
- By optimizing network bandwidth
- By reducing disk I/O
Database partitioning can enhance performance tuning efforts by reducing disk I/O. By dividing large tables into smaller partitions, the database system can access and manipulate data more efficiently, resulting in reduced disk read/write operations and faster query execution times. This helps in improving overall database performance and scalability.
What is the purpose of relationships in graph databases?
- To define foreign keys
- To establish connections between tables
- To express connections or associations between entities
- To organize data in rows and columns
The purpose of relationships in graph databases is to express connections or associations between entities. By defining relationships between nodes (entities), it becomes possible to navigate and query the database based on the connections, providing a more natural and intuitive representation of data relationships.
In compression techniques, _______ is the process of decompressing data back to its original form.
- Compression
- Decompression
- Encryption
- Lossless
Decompression is the process of reversing compression, restoring the compressed data back to its original form. It is a crucial step in the compression-decompression cycle, ensuring that the data can be effectively used after compression.
In Slowly Changing Dimensions (SCD), what is the role of effective start and end dates?
- They are optional in SCD
- They are used for sorting records
- They define the period during which a record is valid
- They indicate the creation and modification dates
Effective start and end dates in SCD define the period during which a record is valid. These dates help in tracking changes over time, enabling historical analysis and ensuring accurate representation of data at any given point.
What strategies can be employed to implement denormalization effectively?
- Data replication
- Database normalization
- Horizontal partitioning
- Materialized views
Employing materialized views is a strategy for implementing denormalization effectively. Materialized views store precomputed results, reducing the need for complex joins and enhancing query performance in a denormalized schema.
Scenario: A large organization is undergoing a data modeling project involving multiple teams across different locations. How would you ensure effective collaboration among these teams?
- Assign tasks independently to each team
- Hold regular virtual meetings
- Rely solely on email communication
- Use collaborative tools and platforms
To ensure effective collaboration among teams in a data modeling project, using collaborative tools and platforms is essential. These tools allow teams to share documents, communicate in real-time, track changes, and coordinate tasks seamlessly across different locations, fostering collaboration and efficiency.
What is the significance of surrogate keys in Dimensional Modeling?
- Surrogate keys are optional and are used only for primary key constraints
- Surrogate keys are the same as natural keys, representing actual business data
- Surrogate keys are used for foreign key constraints, ensuring referential integrity
- Surrogate keys uniquely identify each record, eliminate dependencies on natural keys, simplify data warehouse maintenance
Surrogate keys in Dimensional Modeling serve a crucial role by uniquely identifying each record, eliminating dependencies on natural keys, and simplifying data warehouse maintenance. They contribute to data warehouse performance and ease of management.