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Questions and Answers
What is the key difference between a database system and a file system?
What is the key difference between a database system and a file system?
- Database systems provide data independence, while file systems do not. (correct)
- Database systems have instances and schema, while file systems do not.
- Database systems use ER diagrams, while file systems do not.
- Database systems have OLAP and OLTP, while file systems do not.
What does OLAP stand for in the context of databases?
What does OLAP stand for in the context of databases?
- Online Transactional Processing
- Online Analytical Processing (correct)
- Optical Layered Architecture Protocol
- Optimized Logical Analysis Process
What is the purpose of normalization in a relational database?
What is the purpose of normalization in a relational database?
- To reduce data redundancy and dependency (correct)
- To complicate the database structure
- To speed up the data retrieval process
- To increase data duplication
What is the primary goal of indexing in a database?
What is the primary goal of indexing in a database?
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Which operation in relational algebra is used to combine tuples from two relations, but only those that satisfy a specified condition?
Which operation in relational algebra is used to combine tuples from two relations, but only those that satisfy a specified condition?
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Study Notes
Database Systems vs. File Systems
- A database system manages data as a collection of interconnected data, while a file system manages data as a collection of separate files.
OLAP in Databases
- OLAP stands for Online Analytical Processing, which is a technology that enables fast and efficient analysis of data in a database.
Normalization in Relational Databases
- Normalization is the process of organizing the data in a relational database to minimize data redundancy and dependency.
- The purpose of normalization is to ensure data consistency, reduce data redundancy, and improve data integrity.
Indexing in Databases
- The primary goal of indexing in a database is to improve the speed of data retrieval by providing a quick way to locate specific data.
Relational Algebra Operations
- The JOIN operation in relational algebra is used to combine tuples from two relations, but only those that satisfy a specified condition.
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