Database Concepts
Karnataka Board · Class 12 · Computer Science
Flashcards for Database Concepts — Karnataka Board Class 12 Computer Science. Quick Q&A cards covering key concepts, definitions, and formulas.
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Get startedWhat is a file system and what are its main limitations in data management?
Answer
A file system is a method where data is stored in separate files on computer storage devices. Main limitations include: (1) Difficulty in Access - requires writing programs to retrieve data, (2) Data …
Define Database Management System (DBMS) and explain its role.
Answer
A Database Management System (DBMS) is software that creates and manages databases. It serves as an interface between users/applications and the database, allowing users to store, manage, update, modi…
What is database schema and how is it different from database instance?
Answer
Database Schema is the design/structure of a database showing table names, fields, data types, constraints and relationships - it's the skeleton or logical architecture. Database Instance is the actua…
Explain data constraint with an example from the school attendance system.
Answer
Data constraints are restrictions/limitations on the type of data that can be inserted in table columns. They ensure data accuracy and reliability. Example: In STUDENT table, RollNumber column can hav…
What is meta-data or data dictionary in DBMS?
Answer
Meta-data or data dictionary is data about the data. It stores the database schema along with various constraints in a database catalog maintained by DBMS. It contains information about table structur…
Define the three data manipulation operations in DBMS with examples.
Answer
Three data manipulation operations are: (1) Insertion - Adding new data (e.g., new student joins, add to STUDENT and GUARDIAN tables), (2) Deletion - Removing data (e.g., student leaves school, remove…
What is a relational data model and why is it most commonly used?
Answer
Relational data model organizes data in tables (called relations) with rows and columns. Each table has multiple columns with unique names, and each row represents related set of values. It's most com…
Define the following terms in relational model: Attribute, Tuple, Domain, Degree, Cardinality
Answer
Attribute: Column/field in a table (e.g., GUID, GName). Tuple: Each row of data in a relation. Domain: Set of possible values for an attribute (e.g., integers for RollNumber). Degree: Number of attrib…
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Sources & Official References
- Karnataka SSLC — kseeb.kar.nic.in
- Dept of Pre-University Education, Karnataka
- National Education Policy 2020 — education.gov.in
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