This chapter focuses on the principles of database management, covering file systems, database management systems, relational models, and the importance of keys in databases.
Database Concepts - Quick Look Revision Guide
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This compact guide covers 20 must-know concepts from Database Concepts aligned with Class 12 preparation for Computer Science. Ideal for last-minute revision or daily review.
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Key Points
Define Database Management System (DBMS).
A DBMS is software that allows for creating, managing, and manipulating databases.
Explain Redundancy in File Systems.
Redundancy occurs when the same data is duplicated in multiple files, leading to inconsistencies.
State three limitations of file systems.
Limitations include data redundancy, data inconsistency, and difficulty in accessing data efficiently.
What is a Database Schema?
A schema defines the structure of a database, including tables and fields, and how they relate.
Define primary key.
A primary key uniquely identifies each record in a table, ensuring no two records are identical.
What is a foreign key?
A foreign key is an attribute in one table that refers to the primary key in another table, establishing a link.
Explain Query in DBMS.
A query is a request for data retrieval from a database, often expressed in SQL.
Differentiate between Degree and Cardinality.
Degree refers to the number of attributes in a table, while cardinality indicates the number of tuples.
What is Data Manipulation?
Data manipulation includes insertion, deletion, and updating of records in a database.
Explain Data Inconsistency.
Data inconsistency occurs when duplicate data does not match across different files or tables.
Describe Types of Keys.
Types include primary keys (unique identifier), foreign keys (reference between tables), and candidate keys (potential primary keys).
What is metadata?
Metadata describes the structure, constraints, and properties of the data stored in the database.
State importance of Data Constraints.
Constraints enforce limits on data for accuracy and reliability, such as NOT NULL or UNIQUE conditions.
Define database instance.
A database instance is the state of a database at a specific point in time, after data has been loaded into it.
Limitations of DBMS.
Increased complexity and vulnerability arise when using a DBMS due to centralization and management needs.
State importance of Queries.
Queries are crucial for efficiently retrieving and manipulating data within a relational database.
Explain Atomic Values.
Atomic values in a database mean that each value is indivisible, ensuring simplicity in data management.
What is a Composite Primary Key?
It is created when a single attribute cannot uniquely identify a record, hence multiple attributes are combined.
Property of Data Validation.
Data validation checks data correctness and relevance, ensuring entries meet predefined criteria.
Applications of Databases in Real Life.
Databases are widely used in banking, inventory management, online shopping, and many more sectors.
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