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What is a Database Instance?

What is an Instance in DBMS?

A database Instance is the state of a database at a particular moment in time. It is a snapshot of the data in the database as it exists at that moment. Every time the data is added, modified, or deleted, the instance of the database changes.

Instance vs. Schema:
  • Schema: The schema is the logical blueprint or structure of the database. It defines the tables, columns, data types, and relationships. The schema is static and does not change frequently.
  • Instance: The instance is the actual data contained in the database at a specific point in time. It is dynamic and changes whenever a transaction modifies the data.

In simple terms, the schema is the design, and the instance is the data that fits into that design at any given moment.

In this Chapter

What is a Database Instance?
What is DBMS in English
What is a Database in English
Advantages and Disadvantages of DBMS in English
Data Independence in English – What is Data Independence?
BCA || DBMS(Database Management System) 2025 (Supplementary) Paper || MDSU Exam Paper
What is an Entity in DBMS?
Database Languages
What is an Entity Set?
Entity-Relationship (ER) Model
Data Models & Their Types
JOINs and Their Types
Tuples and Their Types
What is a Domain in DBMS?
Database Interfaces and Their Types
Data Abstraction in DBMS
Data Integrity in DBMS
What is a Database Schema?
Database Constraints
Keys in DBMS and Their Types
What is a Data Dictionary?
What is a Relationship Set?
What is a Distributed File System?
Difference Between DBMS & Filesystem
DBMS Security
Relational Algebra
Database Recovery
Inference Rules
Dependencies and Their Types
File Organization
Distributed Database System
Normalization
BCA | DBMS 2022 Paper | MDSU Exam Paper