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Questions and Answers
What is the term for the independence of data structures and storage organization from DBMS access programs?
What is the term for the independence of data structures and storage organization from DBMS access programs?
What is the capacity to change the physical schema without having to change the conceptual or logical schema?
What is the capacity to change the physical schema without having to change the conceptual or logical schema?
What is the primary function of a recovery subsystem in a DBMS?
What is the primary function of a recovery subsystem in a DBMS?
What allows hundreds of concurrent transactions to execute per second in OLTP?
What allows hundreds of concurrent transactions to execute per second in OLTP?
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What is the term for presenting users with a conceptual view of the database, hiding storage details?
What is the term for presenting users with a conceptual view of the database, hiding storage details?
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What is the result of using a data model to hide storage details?
What is the result of using a data model to hide storage details?
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What is the benefit of supporting multiple views of the data?
What is the benefit of supporting multiple views of the data?
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What is the primary function of the DBMS in supporting multiple views of the data?
What is the primary function of the DBMS in supporting multiple views of the data?
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What is the term for allowing a set of concurrent users to retrieve from and update the database?
What is the term for allowing a set of concurrent users to retrieve from and update the database?
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What is the primary characteristic of OLTP?
What is the primary characteristic of OLTP?
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Study Notes
DBMS Components
- A DBMS consists of several subsystems, each responsible for a specific function.
- It interacts with the operating system to manage and access data.
Functions of DBMS
- Defines a database in terms of its data types, structures, and constraints.
- Constructs or loads the initial database contents on a secondary storage device.
- Manipulates the database through retrieval (querying, reporting, and accessing through Web applications) and update (insertions, deletions, and modifications).
- Processes and shares data among concurrent users and application programs while maintaining data validity and consistency.
- Provides security measures to prevent unauthorized access.
- Presents and visualizes data.
- Performs system and software maintenance of the database and associated programs.
Users Interaction with Databases
- Users interact with databases through their applications, which are programs that utilize the data stored in a database.
- Applications generate queries (retrieval) and update transactions (insert, delete, modify) that access different parts of the data.
Database Applications
- Applications must not allow unauthorized users to access data and must keep up with changing user requirements.
- Applications interact with a database by generating queries and update transactions.
Advantages of Using the Database Approach
- Controls redundancy in data storage and development and maintenance efforts.
- Represents complex relationships among data and provides storage structures for efficient query processing.
- Provides backup and recovery services.
- Restricts unauthorized access to data.
- Shares data among multiple users.
- Optimizes queries for efficient processing.
- Enforces integrity constraints on the database.
- Provides multiple interfaces to different classes of users.
Additional Implications of Using the Database Approach
- Enforces standards.
- Reduces application development time.
- Provides economies of scale across applications and departments.
- Offers flexibility to change data structures.
- Makes current information available.
Database Users
- Database Administrators (DBA): authorize access, coordinate, control, and monitor database use, acquire software and hardware resources, and monitor efficiency.
- Database Analysts and Designers: define content, structure, constraints, and functions or transactions against the database and communicate with end-users.
- Database Application Developers: write application programs, including system analysts, application programmers, and business analysts.
- Database End-users: use data for queries, reports, and updates.
Database Characteristics
- Insulation between programs and data: allows changing data structures and storage organization without changing DBMS access programs.
- Logical data independence: allows changing conceptual or logical schemas without changing requirements representations and associated application programs.
- Physical data independence: allows changing physical schema without changing conceptual or logical schema.
The Three-Levels Mapping
- Main Characteristics of the Database Approach
- Data Abstraction: a data model is used to hide storage details and present a conceptual view of the database.
- Support of multiple views of the data: each user sees a different view of the database, which describes only the data of interest to that user.
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Description
This quiz covers the components and functions of a Database Management System (DBMS), including defining database structures, constructing initial database contents, and manipulating data.
