8/13/2019 Report Data Warehousing

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Deepa Vaidhyanathan

Graduate Student- Department of Computer and Information Systems.

Data Warehousing/OLAP eport

Table of Contents

1 The Evolution: ......................................................................................................................................21.1 Problems with the Naturally Evolving Architecture.....................................................................2

1.2 Architected Environment:..............................................................................................................2

2 Data warehouse environment................................................................................................................32.1 ub!ect orientation.........................................................................................................................3

2.2 "ntegration.....................................................................................................................................#

2.3 Time $ariant:.................................................................................................................................#

2.# Non $olatile:..................................................................................................................................%2.% tructure o& a Data warehouse.......................................................................................................'

2.' (low o& data...................................................................................................................................)2.) *ranularity.....................................................................................................................................+2.+ Partitioning A,,roach....................................................................................................................-

3 The Data warehouse and Design.........................................................................................................1

3.1 Data E/traction &rom 0,erational Environment.........................................................................13.2 The Data arehouse and Data odels........................................................................................11

3.3 or,orate Data odel.................................................................................................................11

3.# Data arehouse Data odel.......................................................................................................123.% id level Data odel..................................................................................................................12

3.' The Physical Data odel............................................................................................................13

# *ranularity in the Data arehouse.....................................................................................................13

#.1 4aw Estimates.............................................................................................................................13#.2 5evels o& *ranularity...................................................................................................................1#

% igration to the Architected Environment.........................................................................................1#

%.1 A igration Plan.........................................................................................................................1#' onclusion..........................................................................................................................................1%

) 6oo7s and 4e&erences.........................................................................................................................1%

8/13/2019 Report Data Warehousing

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Data warehouse is a re,ository o& an organi8ation9s electronically stored data. Data warehouses are

designed to &acilitate re,orting and analysis in this course we would cover all the basic conce,ts o& data

warehousing. 6y the end o& this course wor7 we will also 7now how a data warehouse is being build

and maintained.

1 The Evolution:Previously in the beginning the D decision su,,ort systems; was develo,ed a&ter a long and

com,le/ evolution o& in&ormation technology. ome o& the main evolutions included the ,unch cards