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database objects

Innocent Iguana answered on February 22, 2023 Popularity 10/10 Helpfulness 1/10

answer database objects

database objects

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- Instance 
	- Top level in hierarchy
    - Provides unique server environment for contained databases
    - Allows isolation between databases
- Database 
	- Stores, manages and provides access to data
    - Contains objects (Tables, Views, Index)
    - Uses related tables to reduce redundancy
    - Can be distributed across multiple systems
    - One instance may have more than 1 database
- Schema 
	- Logical grouping of objects within a database
    - Provides context : Allows multiple apps to store data in single database
    - Contains Tables, Views, Functions, Packages
    - In most databases default is user schema
- Objects
	- Items within a database
    - Tables: Logical structures consisting of rows and columns to store data
	- Constraints : Ways of providing rules or restrictions on data
	- Index : Set of pointers in database that provides uniqueness of data
	- Key : Uniquely identify rows in a table and defines relationship between tables
    - Views: Way of representing data from one or more tables, requires no permanent storage
    - Aliases: Alternative name for an object
    - Events: Actions on a database that initiate trigger
    - Trigger: A set of actions performed in response to Insert, Update, Delete on specified table
    - Log files : Stores information about transactions in a database

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Contributed on Feb 22 2023

Innocent Iguana

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