26 Questions
What is the main characteristic of file-based data management?
Data is stored in separate files without explicit relationships
What is the main advantage of the database approach to data management?
Data sharing among different users
What does DBMS stand for?
Database Management System
What is the purpose of a relational database management system (RDMS)?
To design data in tabular form
In file-based data management, how is data stored?
In separate files without explicit relationships
What is the main disadvantage of file-based data management compared to the database approach?
Inability to avoid data redundancy
What is the purpose of tables in a database?
To store unique records and organize data into rows and columns
What does 'degree' refer to in the context of a database table?
The number of columns in the table
Which term is used to represent a single piece of information or data value stored within a record or row in a database?
Field
What do data types determine in a database?
The format of data storage that can hold distinct types or ranges of values
Which data type is used to represent whole numbers that can have positive, negative, or zero values?
Integer
What is the purpose of varchar data type in a database?
To represent text with variable length
What does each character occupy in terms of space in a computer?
1 byte
Which type of number contains decimals and fractions in a database?
Floating Point Number
What does 'array' contain in a database?
'Array' contains group of elements which can be of same data type
What is the main purpose of 'string' data type in a database?
To represent text
What is the purpose of a database table?
To organize data into rows and columns
What does the term 'degree' refer to in the context of a database table?
The number of columns in the table
What do data types determine in a database?
The range of values that can be held by the variables
What is the main characteristic of file-based data management?
Storing data directly into variables
What does the term 'array' contain in a database?
A collection of values of the same type
What is the main advantage of using a database approach to data management?
Avoiding data redundancy and isolating departmental files
What is the purpose of a database management system (DBMS)?
To enable users to access the database and manipulate data
What does the term 'data independence' refer to in the context of a database approach?
Supporting all users of the organization without the need for isolated data management
What is the main disadvantage of file-based data management compared to the database approach?
Each user or department managing its own isolated data
What is the main characteristic of a relational Data Base Management System (RDMS)?
Storing data in tabular form
Study Notes
File-Based Data Management
- Main characteristic: Data is stored in separate files, making it difficult to manage and retrieve.
Database Approach
- Main advantage: Allows for efficient data management, retrieval, and sharing.
- DBMS stands for Database Management System.
- DBMS is responsible for creating, modifying, and querying databases.
Relational Database Management System (RDMS)
- Purpose: To manage and provide access to data in a relational database.
Data Storage
- In file-based data management, data is stored in separate files.
- In a database, data is stored in tables.
Disadvantages of File-Based Data Management
- Main disadvantage: Difficult to manage and retrieve data due to data redundancy and inconsistency.
Tables in a Database
- Purpose: To organize and store data in a structured format.
- A table consists of rows (records) and columns (fields).
Database Terminology
- Degree: Refers to the number of columns in a table.
- Field or column: Represents a single piece of information or data value stored within a record or row.
- Data types: Determine the type of data that can be stored in a field, such as numeric, character, or date.
Data Types
- Determines the type of data that can be stored in a field.
- Examples of data types:
- Integer: Whole numbers that can have positive, negative, or zero values.
- Varchar: Characters of varying length, each occupying one byte of space in a computer.
- Real numbers: Contain decimals and fractions.
- Array: A collection of values of the same type.
- String: A sequence of characters, used to represent text data.
- Purpose: To ensure data consistency and prevent errors.
Database Management System (DBMS)
- Purpose: To create, modify, and query databases.
- DBMS provides data independence, allowing changes to the physical structure of the database without affecting the application.
Relational Data Base Management System (RDMS)
- Main characteristic: Data is organized into tables with relationships between them.
- RDMS provides a flexible and scalable way to manage large amounts of data.
Test your knowledge of file-based data management, database approach to data management, database management systems, and the advantages of database management.
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