_______ 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.
Database design tools help users visualize the database schema through _______.
- Code and Scripts
- Entity-Relationship Diagrams (ERD)
- Graphs and Charts
- Tables and Fields
Database design tools like MySQL Workbench or Microsoft Visio use Entity-Relationship Diagrams (ERD) to help users visualize the database schema. ERDs illustrate the relationships between entities and their attributes, aiding in the understanding and planning of the database structure.
In relational schema design, a _______ key uniquely identifies a record within a table.
- Candidate
- Composite
- Foreign
- Primary
In relational schema design, a primary key uniquely identifies a record within a table. It serves as a unique identifier for each row and ensures data integrity in the table.
_______ is the highest level of normalization that a relational database can achieve.
- Boyce-Codd Normal Form (BCNF)
- Fifth Normal Form (5NF)
- Fourth Normal Form (4NF)
- Third Normal Form (3NF)
Boyce-Codd Normal Form (BCNF) is the highest level of normalization that a relational database can achieve. It ensures that there are no non-trivial functional dependencies of attributes on the primary key.
An attribute is said to be _______ if it is dependent on the primary key, as well as on some other attribute(s) within the same table.
- Composite
- Derived
- Multivalued
- Transitive
An attribute is said to be Transitive if it is dependent on the primary key, as well as on some other attribute(s) within the same table. This situation is resolved by normalization to reduce redundancy.
A large e-commerce website experiences slow query performance due to a massive volume of customer data. What relational schema design technique could you employ to optimize storage and enhance query performance?
- Denormalization
- Indexing
- Normalization
- Sharding
In this scenario, to enhance query performance, denormalization can be employed. Denormalization involves introducing redundancy in the database design to reduce the number of joins, leading to faster query execution. It's especially useful when dealing with read-heavy workloads and large datasets.
Conceptual schema design is closely related to __________, ensuring the database accurately represents the real-world domain.
- Database normalization
- Entity-Relationship modeling
- Logical schema design
- Physical schema design
Conceptual schema design is closely related to Entity-Relationship modeling, where the focus is on defining entities, their attributes, and the relationships between them. This step ensures that the database accurately represents the real-world domain.
The process of denormalizing tables in Dimensional Modeling is known as _______.
- Factoring
- Normalization
- Snowflaking
- Star Schema
The process of denormalizing tables in Dimensional Modeling is known as Star Schema. In Star Schema, the Fact table is surrounded by Dimension tables, creating a star-like structure. This denormalized design enhances query performance for analytical queries and reporting.
_______ is a technique used to improve storage efficiency by dynamically allocating storage space based on data access patterns.
- Data Clustering
- Data Compression
- Data Partitioning
- Data Shuffling
Data Partitioning is a technique used to improve storage efficiency by dynamically allocating storage space based on data access patterns. It involves dividing large datasets into smaller, more manageable partitions. This helps in optimizing query performance and storage utilization.