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Designing Data Marts for Data Warehouses

How data marts are used for creating data warehouse?
A data mart is a subset of a data warehouse focused on a particular line of business, department, or subject area.
Data marts make specific data available to a defined group of users, which allows those users to quickly access critical insights without wasting time searching through an entire data warehouse.
How to design a data warehouse?
Key 7 steps to data warehouse design
1Engineer requirements.
2) Discover data needs.
3) Conceptualize data warehouse.
4) Plan the project.
5) Select data warehouse technologies.
6) Analyze the system and design data governance.
7) Model data and design ETL processes.
How do you make a good datamart?
Best Practices for Data Mart Architecture Design
1Define the Scope of Data Mart.
2) Pay Attention to the Logical Data Mart Model.
3) Identify Relevant Data.
4) Narrow Down the Data Sources.
5) Design the Star Schema.
1Step 1: Design.
This is the first step when building a Data Mart.
2) Step 2: Build / Construct.
This is the step during which both the physical and the logical structures for the Data Mart are created.
3) Step 3: Populate / Data Transfer.
4) Step 4: Data Access.
5) Step 5: Manage.

How data marts are used for creating data warehouse?