In this tutorial we will learn about the following terms.
1. File
2. Record
3. Instance
4. Schema
A data set is a collection of data that represents a single item or entity. For example, a record may contain information about an individual. B. Name, address and phone number.
A file, on the other hand, is a collection of records stored together in a computer system. Files are typically stored on disk and given a name to identify them. Each file can contain multiple records, and each record in the file is typically structured in a similar way, using the same set of fields or attributes to represent the data.
For example, a file might contain a collection of records representing customers, where each record represents an individual customer with fields for name, address, and phone number. This file can be used to store and manage customer data so that information can be easily accessed, updated and analyzed.
In database management systems (DBMS), an instance is the occurrence of a particular piece of data in a database at a particular point in time. This refers to the actual data stored in database tables and is sometimes called "runtime data".
Schema, on the other hand, refers to the overall structure and organization of the database, including the names, data types, and relationships of the data stored in the database. A schema defines the structure of data and how it is organized, but does not contain the actual data values.
Think of a schema as a blueprint or plan for your database. An instance is the actual implementation of that plan.
Schema, on the other hand, refers to the overall structure and organization of the database, including the names, data types, and relationships of the data stored in the database. A schema defines the structure of data and how it is organized, but does not contain the actual data values.
Think of a schema as a blueprint or plan for your database. An instance is the actual implementation of that plan.