5 Questions
What is the purpose of normalization in a relational database?
To minimize data redundancy and dependency
What does OLAP stand for in the context of databases?
Online Analytical Processing
What is the purpose of a primary index in database systems?
To uniquely identify each record in the file
What is the main difference between clustered and secondary indexing?
Clustered indexing defines the physical order of data, while secondary indexing provides an additional path to data
What is the purpose of the Relational Algebra operation 'Project'?
To select only specific columns from a relation
Study Notes
Database Concepts
- Normalization in a relational database ensures that each piece of data is stored in one place and one place only, minimizing data redundancy and improving data integrity.
- OLAP stands for Online Analytical Processing, a technology that enables fast and efficient analysis of data for business decisions.
- A primary index in database systems is used to speed up queries by providing a quick way to locate specific data, and it is automatically created by the database management system when a primary key is defined.
- The main difference between clustered and secondary indexing is that a clustered index reorders the physical records of the table according to the indexed column, whereas a secondary index does not alter the physical order of the records, it only maintains a separate data structure to speed up queries.
- The purpose of the Relational Algebra operation 'Project' is to select specific columns from a relation, similar to the SQL SELECT clause, and it is used to simplify relations by removing unwanted attributes.
Test your knowledge of database fundamentals and ER diagram concepts with this quiz. Explore topics such as data and information, database systems, entity-relationship diagrams, and more.
Make Your Own Quizzes and Flashcards
Convert your notes into interactive study material.
Get started for free
