Data Mining and Data Warehousing – a connected view.

Data Mining and Data Warehousing – a connected view

Introduction

• Data mining describes a collection of techniques that aim to find useful but undiscovered patterns in collected data

• The goal of data mining is to create models for decision-making that predict future behavior based on analysis of past activity

Introduction

• Data warehousing is a blend of technologies aimed at the effective integration of operational databases into an environment that enables the strategic use of data. These technologies include relational and multidimensional database management systems, client/server architecture, metadata modeling and repositories, graphical user interfaces, and much more.

Operational vs Informational Databases

Table 2-1 Operational Versus informational Databases

Operational vs Informational Databases

Table 2-2 Comparison of Data Stores, and Data Warehouses

Definition and characteristics of a data warehouse

• It’s a database designed for analytical tasks• It supports a relatively small number of users• Its usage is read-intensive• Its content is periodically updated (mostly additions)• It contains current and historical dta• It contains a few large tables• Each query frequently results in a large result set and involves

frequent full table scan and multi-table joins• A formal definition of the data warehouse is offered by W.H.

Inmon– A data warehouse is a subject-oriented, integrated, time-variant, non-

volatile collection of data in support of management decisions

Data warehouse architecture

Figure 2-1 Data Warehouse Environment

Data warehouse architecture

Figure 2-1 Data Warehouse and Data Operational Data Store

Data warehouse architecture

Figure 2-3 Two-tiered Data WarehouseArchitecture

Data warehouse architecture

Figure 2-4 Multi-tiered Data WarehouseArchitecture

Data mining defined

• Data mining as the process of discovering meaningful new correlations, patterns, and trends by digging into (mining) large amounts of data stored in warehouse.

• The major attraction of data mining is its capability to build predictive rather than retrospective models

Predictive versus Retrospective Models

Table 2-3 Predictive Versus Retrospective Models

Data Mining application Domain

• Customer retention

• Sales and customer service

• Marketing

• Risk Assessment and Fraud Detection

Data Mining Categories and Research Focus

• Data mining techniques deal with discovery and learning, and as such fall into three major learning modes: supervised, unsupervised, and reinforcement learning

• Data mining techniques can be categorized:– Representation of models and results

– The type of data the techniques operates on

– Application type

– Pattern attributes

Data Mining Categories and Research Focus

• Data mining categorized by business problems– Retrospective Analysis

– Predictive Analysis

• These two classes of business problems can be further classified by– Classification

– Clustering/Segmentation

– Associations

– Sequencing

Data Mining Categories and Research Focus

• Approaches that underlie the most contemporary research in data mining:– The induction approach– The database querying approach– The compression approach– The approach of approximation and searching