What is the primary purpose of data partitioning in database management?

  • Ensuring data integrity
  • Improving query performance
  • Reducing storage costs
  • Simplifying database design
The primary purpose of data partitioning in database management is to improve query performance. By dividing large tables into smaller, more manageable partitions, database systems can execute queries more efficiently by accessing only relevant partitions rather than scanning the entire table. This enhances overall database performance.

In Slowly Changing Dimensions (SCD), Type 1 only _______ existing records.

  • deletes
  • inserts
  • modifies
  • updates
In Type 1 Slowly Changing Dimensions (SCD), only updates existing records. When there is a change in the source data, the existing record in the dimension table is directly updated with the new information, and there is no maintenance of historical data.

How does partitioning contribute to improving database performance?

  • By improving data consistency
  • By increasing data redundancy
  • By reducing query execution time
  • By reducing the size of indexes
Partitioning contributes to improving database performance by reducing query execution time. It allows queries to access only relevant partitions, minimizing the amount of data that needs to be scanned or processed. This results in faster query response times and better overall system performance.

Which database design tool is more suitable for large-scale enterprise projects, MySQL Workbench or Microsoft Visio?

  • Both are equally suitable
  • It depends on the project requirements
  • Microsoft Visio
  • MySQL Workbench
The suitability of MySQL Workbench or Microsoft Visio for large-scale enterprise projects depends on various factors, including the specific project requirements, team expertise, and integration capabilities. Each tool has its strengths and weaknesses, making it essential to evaluate them based on the unique needs of the enterprise project.

_______ constraints are used to enforce business rules that cannot be expressed using other constraints.

  • Assertion
  • Check
  • Default
  • Unique
Assertion constraints are used to enforce business rules that cannot be expressed using other constraints. They are typically used for complex rules that involve multiple columns or tables. This ensures that the data in the database adheres to specific business logic.

_______ is a technique used to physically organize data on storage devices to improve query performance.

  • Indexing
  • Normalization
  • Partitioning
  • Sorting
Partitioning is a technique used to physically organize data on storage devices to improve query performance. It involves dividing large tables into smaller, more manageable partitions based on certain criteria. This helps in reducing the amount of data that needs to be scanned during queries, thereby enhancing performance.

What is the significance of a cascade delete constraint in database design?

  • It allows deletion of a parent record even if related child records exist
  • It automatically deletes all records in a table when a deletion occurs in a related table
  • It enforces referential integrity by preventing deletion of a parent record if related child records exist
  • It is not a valid constraint in database design
A cascade delete constraint in database design ensures referential integrity by automatically deleting related child records when a parent record is deleted. This helps maintain consistency in the database.

Scenario: A company wants to ensure that every order placed in their system has a corresponding customer. Which type of constraint would you apply to the order table to enforce this rule?

  • Check Constraint
  • Foreign Key Constraint
  • Primary Key Constraint
  • Unique Constraint
To ensure that every order has a corresponding customer, you would apply a Foreign Key Constraint to the order table. This constraint establishes a link between the order table and the customer table, preventing orders without a matching customer.

In a one-to-many relationship, which entity holds the foreign key?

  • Both entities
  • It depends on the database design
  • Many entities
  • One entity randomly chosen
In a one-to-many relationship, the entity on the "many" side holds the foreign key. This key establishes the link between the two tables, allowing the "many" side to reference the primary key of the "one" side.

Which type of NoSQL database is best suited for hierarchical data with dynamic schemas?

  • Column-family database
  • Document-oriented database
  • Graph database
  • Key-value store database
A document-oriented database is best suited for hierarchical data with dynamic schemas. It allows storing complex, nested data structures in a document format (e.g., JSON or XML), making it flexible for evolving data requirements.