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Concept of Data Warehousing and Data Mining

A data warehouse is a centralized, large-scale repository designed to store historical and consolidated data collected from multiple sources across an organization.

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  • It is primarily used for data analysis, reporting, and business intelligence rather than routine transaction processing.
  • The main purpose of a data warehouse is to integrate data from various operational databases, clean and transform it into a unified format, and make it available for decision-making and strategic analysis.

Key Components of Data Warehousing:

1.) ETL Process (Extract, Transform, Load):

  • This is a crucial process where data is:
    • Extracted from various operational systems (like CRM, ERP)
    • Transformed into a consistent format (cleaned, filtered, structured)
    • Loaded into the data warehouse for analysis

2.) OLAP (Online Analytical Processing):

  • OLAP enables users to perform multidimensional analysis on large volumes of data.
  • It allows operations like slicing, dicing, drilling down, and pivoting to gain meaningful insights from various business perspectives (e.g., sales by region, time, or product category).

Data mining is the process of analyzing large datasets to discover hidden patterns, trends, relationships, and useful information that are not immediately obvious.

  • It combines elements of machine learning, statistics, and database systems to uncover insights that support better decision-making.
  • Data mining helps organizations predict behaviors, classify information, detect anomalies, and identify associations between variables.

Key Techniques in Data Mining:

  • Classification: This technique involves sorting data into predefined categories or classes.
  • Clustering: Clustering involves grouping similar data points into clusters based on shared characteristics.
  • Association: This technique finds relationships or correlations between items in a dataset.
  • Regression: Regression is used to predict continuous numeric values based on input variables.

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