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Questions and Answers
What is NOT considered an advantage of using a Database Management System (DBMS)?
What is NOT considered an advantage of using a Database Management System (DBMS)?
Which generation of database systems is characterized by relational databases?
Which generation of database systems is characterized by relational databases?
Which role is primarily responsible for the performance and security of the database?
Which role is primarily responsible for the performance and security of the database?
What is a common disadvantage associated with database management systems?
What is a common disadvantage associated with database management systems?
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Which factor is NOT typically improved by a DBMS?
Which factor is NOT typically improved by a DBMS?
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What is a significant disadvantage of a file-based system compared to a database system?
What is a significant disadvantage of a file-based system compared to a database system?
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Which of the following is NOT a function typically associated with a Database Management System (DBMS)?
Which of the following is NOT a function typically associated with a Database Management System (DBMS)?
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What problem arises from the duplication of data in file-based systems?
What problem arises from the duplication of data in file-based systems?
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What is meant by 'data dependence' in the context of file-based systems?
What is meant by 'data dependence' in the context of file-based systems?
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What defines a Database Management System (DBMS)?
What defines a Database Management System (DBMS)?
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Which of the following describes how data is managed in a database approach?
Which of the following describes how data is managed in a database approach?
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What is typically a major component of the DBMS environment?
What is typically a major component of the DBMS environment?
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Which of the following scenarios illustrates a common application of a database system?
Which of the following scenarios illustrates a common application of a database system?
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What is the primary purpose of a Database Management System (DBMS)?
What is the primary purpose of a Database Management System (DBMS)?
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Which of the following best describes a view in the context of a database?
Which of the following best describes a view in the context of a database?
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What component of the DBMS environment describes the type of information the organization uses?
What component of the DBMS environment describes the type of information the organization uses?
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Which of the following is NOT a controlled access feature of a database?
Which of the following is NOT a controlled access feature of a database?
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Which description of Data Definition Language (DDL) is accurate?
Which description of Data Definition Language (DDL) is accurate?
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What is one benefit of using views in a database?
What is one benefit of using views in a database?
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What is the role of a system catalog in a database?
What is the role of a system catalog in a database?
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Which of the following statements about database applications is correct?
Which of the following statements about database applications is correct?
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Study Notes
CMT 302 - Advanced Database Systems - Lecture Notes
- Course: CMT 302 - Advanced Database Systems
- Instructor: Prof. Barasa Joel
- Contact Information: [email protected], +254769257365 or +254705451853
Chapter 1 - Introduction to Databases
- Objectives: This chapter covers common database uses, file-based system characteristics and problems, database meaning, and Database Management System (DBMS) meaning.
- Typical DBMS functions: Includes the functionality of a DBMS.
- DBMS environment components: Outlines the key components.
- Personnel in DBMS environment: Describes the different roles.
- DBMS history: This includes the evolution of DBMSs from different generations.
- DBMS advantages and disadvantages: Lists benefits and drawbacks of using a DBMS.
Examples of Database Applications
- Real-world uses such as supermarket purchases, online shopping, booking holidays, library use, taking out insurance, renting videos, internet usage and studying at university are referenced.
File-Based Systems
- Description: This approach comprises various applications that serve end-users, each controlling its own data independently.
- Limitations of file-based systems: Problems inherent in this decentralized approach, such as data isolation, duplication, data dependence, incompatible file formats, fixed queries, and proliferation of applications.
- Examples: A real-world file-based data flow diagram is examined illustrating how data is managed in such systems.
Database Approach
- Rationale: The approach emerged to address limitations of the file-based system, where data definitions were built into applications, limiting access and control.
- Result: Introduction of the database and DBMS concept as a centralized solution with more data control.
Database
- Description: Centralized collection of logically related data (and a description of it). Designed to satisfy organizational information needs.
- Components of the data: Includes Entities, attributes, and relationships for describing data.
- Metadata/System catalog: Description for program-data independence provided by a system catalog.
Database Management System (DBMS)
- Description: A software system that defines, creates, maintains, and controls access to a database. Database application programs interact with the database through SQL statements.
- Diagrammatic representation: A presented diagram illustrates a DBMS interaction (database system and programs interacting with DBMS)
Database Approach
- Data definition language (DDL): Language for defining data types, structures, and constraints stored in a database.
- Data manipulation language (DML): Language for data access—general enquiry facility (query language).
Database Approach - Controlled Access
- Control methods: The various control mechanisms like security, integrity, concurrency, and recovery systems are examined in detail.
Views
- Uses: Allows users to view portions of the database, creating customized database presentations.
- Description: Views are essentially subsets of the complete database, which are useful for tailored presentations and security.
- Benefits: Enhanced complexity reduction, improved security, customizable database appearance, consistent representation, even if the database changes.
Components of DBMS Environment
- Components Diagram: A diagram showing the significant components included in the DBMS context.
- Hardware: Computers from PCs to networks.
- Software: The DBMS, operating system, network software (if required), and associated applications..
- Data: The data used by the organization, and the schema describing it.
- Procedures: Instructions and rules for database and DBMS design and use.
- People: Various roles within a database environment, including Data Admin, Database Admin, Database Designers, programmers, and users.
History of Database Systems
- Database system generations: Information on various generations of database systems (e.g. first-generation—hierarchical, network; second generation - relational, third generation - object-relational, etc.).
Advantages of DBMSs
- Data redundancy control, data consistency, enhanced information from existing data volumes, data sharing, better data integrity, improved security, enforcement of standards, and economy of scale.
- Improved database accessibility, response times, productivity, maintenance capabilities due to data independence, concurrency increase, and backup/recovery.
Disadvantages of DBMSs
- The complexity, size, cost of systems, extra hardware requirements, conversion costs, performance issues, and higher impact of failures.
End of Presentation
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Description
This quiz covers Chapter 1 of CMT 302, focusing on the introduction to databases. It includes objectives such as the meaning of databases, functions of DBMS, personnel roles in the environment, and the history of DBMS. Additionally, it explores advantages and disadvantages of using database management systems.
