SlideShare a Scribd company logo
By Timothy Valihora
 Information technology specialist and executive
leader Timothy Valihora is the president of TVMG
Consulting. A certified IBM Information Server Expert,
Timothy Valihora provides consulting services to
firms seeking software, system management, and
server solutions.
A data warehouse is a collection of historical data
containing raw material that is used to help analysts
and executives with administration, creating reports,
mining data, and making corporate decisions. When
integrating heterogeneous databases for the
construction of a data warehouse, the two common
approaches include the update-driven approach and
the query-driven approach.
 Also referred to as the “lazy integration” approach,
the query-driven approach is used to construct
integrators, known as “mediators,” and wrappers onto
several heterogeneous databases.
Due to the minimal storage requirement, this
approach results in less space and less drainage on
its sources. Additionally, the approach still functions
when the query needs are not known. However, the
query-driven approach requires complex filtering and
integrating processes, and is therefore less efficient
than its counterpart the update-driven approach.
Thus, the query-driven approach often results in
higher costs when frequent queries or aggregations
are involved.

More Related Content

What's hot

Data Warehouse Concepts and Architecture
Data Warehouse Concepts and ArchitectureData Warehouse Concepts and Architecture
Data Warehouse Concepts and Architecture
Mohd Tousif
 
Big data ppt
Big data pptBig data ppt
Big data ppt
IDBI Bank Ltd.
 
Security Mechanisms
Security MechanismsSecurity Mechanisms
Security Mechanismspriya_trehan
 
Data Mining Overview
Data Mining OverviewData Mining Overview
Data Mining Overview
Golda Margret Sheeba J
 
Data mining slides
Data mining slidesData mining slides
Data mining slidessmj
 
Architecture of data mining system
Architecture of data mining systemArchitecture of data mining system
Architecture of data mining system
ramya marichamy
 
3 Data Mining Tasks
3  Data Mining Tasks3  Data Mining Tasks
3 Data Mining Tasks
Mahmoud Alfarra
 
Data warehousing
Data warehousingData warehousing
Data warehousing
Vigneshwaar Ponnuswamy
 
OLAP operations
OLAP operationsOLAP operations
OLAP operations
kunj desai
 
BIG DATA-Seminar Report
BIG DATA-Seminar ReportBIG DATA-Seminar Report
BIG DATA-Seminar Report
josnapv
 
Introduction to Data Mining
Introduction to Data Mining Introduction to Data Mining
Introduction to Data Mining
Sushil Kulkarni
 
Major issues in data mining
Major issues in data miningMajor issues in data mining
Major issues in data miningSlideshare
 
4.3 multimedia datamining
4.3 multimedia datamining4.3 multimedia datamining
4.3 multimedia datamining
Krish_ver2
 
Data mining presentation.ppt
Data mining presentation.pptData mining presentation.ppt
Data mining presentation.ppt
neelamoberoi1030
 
Introduction to Data warehouse
Introduction to Data warehouseIntroduction to Data warehouse
Introduction to Data warehouse
SwapnilSaurav7
 
Data warehousing - Dr. Radhika Kotecha
Data warehousing - Dr. Radhika KotechaData warehousing - Dr. Radhika Kotecha
Data warehousing - Dr. Radhika Kotecha
Radhika Kotecha
 
Big data unit i
Big data unit iBig data unit i
Big data unit i
Navjot Kaur
 
Data warehousing and data mart
Data warehousing and data martData warehousing and data mart
Data warehousing and data mart
Amit Sarkar
 
cryptography ppt free download
cryptography ppt free downloadcryptography ppt free download
cryptography ppt free download
Twinkal Harsora
 

What's hot (20)

Data Warehouse Concepts and Architecture
Data Warehouse Concepts and ArchitectureData Warehouse Concepts and Architecture
Data Warehouse Concepts and Architecture
 
Big data ppt
Big data pptBig data ppt
Big data ppt
 
Security Mechanisms
Security MechanismsSecurity Mechanisms
Security Mechanisms
 
Data Mining Overview
Data Mining OverviewData Mining Overview
Data Mining Overview
 
Data mining slides
Data mining slidesData mining slides
Data mining slides
 
Architecture of data mining system
Architecture of data mining systemArchitecture of data mining system
Architecture of data mining system
 
3 Data Mining Tasks
3  Data Mining Tasks3  Data Mining Tasks
3 Data Mining Tasks
 
Data warehousing
Data warehousingData warehousing
Data warehousing
 
OLAP operations
OLAP operationsOLAP operations
OLAP operations
 
BIG DATA-Seminar Report
BIG DATA-Seminar ReportBIG DATA-Seminar Report
BIG DATA-Seminar Report
 
Introduction to Data Mining
Introduction to Data Mining Introduction to Data Mining
Introduction to Data Mining
 
Major issues in data mining
Major issues in data miningMajor issues in data mining
Major issues in data mining
 
4.3 multimedia datamining
4.3 multimedia datamining4.3 multimedia datamining
4.3 multimedia datamining
 
Data Mining
Data MiningData Mining
Data Mining
 
Data mining presentation.ppt
Data mining presentation.pptData mining presentation.ppt
Data mining presentation.ppt
 
Introduction to Data warehouse
Introduction to Data warehouseIntroduction to Data warehouse
Introduction to Data warehouse
 
Data warehousing - Dr. Radhika Kotecha
Data warehousing - Dr. Radhika KotechaData warehousing - Dr. Radhika Kotecha
Data warehousing - Dr. Radhika Kotecha
 
Big data unit i
Big data unit iBig data unit i
Big data unit i
 
Data warehousing and data mart
Data warehousing and data martData warehousing and data mart
Data warehousing and data mart
 
cryptography ppt free download
cryptography ppt free downloadcryptography ppt free download
cryptography ppt free download
 

Similar to Introduction to the Query-driven Approach

Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docxChapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
keturahhazelhurst
 
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docxChapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
christinemaritza
 
Business Intelligence Solution on Windows Azure
Business Intelligence Solution on Windows AzureBusiness Intelligence Solution on Windows Azure
Business Intelligence Solution on Windows Azure
Infosys
 
BVRM 402 IMS UNIT V
BVRM 402 IMS UNIT VBVRM 402 IMS UNIT V
BVRM 402 IMS UNIT V
DrNilimaThakur
 
BVRM 402 IMS Database Concept.pptx
BVRM 402 IMS Database Concept.pptxBVRM 402 IMS Database Concept.pptx
BVRM 402 IMS Database Concept.pptx
DrNilimaThakur
 
The Joy Of Bits
The  Joy  Of  BitsThe  Joy  Of  Bits
The Joy Of Bits
Freeform Dynamics
 
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWA
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWADecember 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWA
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWACarsten Roland
 
The Data Warehouse Essays
The Data Warehouse EssaysThe Data Warehouse Essays
The Data Warehouse Essays
Melissa Moore
 
Data Warehouse
Data WarehouseData Warehouse
Data Warehouse
VijayaLakshmi514
 
Data Mesh using Microsoft Fabric
Data Mesh using Microsoft FabricData Mesh using Microsoft Fabric
Data Mesh using Microsoft Fabric
Nathan Bijnens
 
Bi
BiBi
Data warehouse-testing
Data warehouse-testingData warehouse-testing
Data warehouse-testingraianup
 
Oracle sql plsql & dw
Oracle sql plsql & dwOracle sql plsql & dw
Oracle sql plsql & dw
Sateesh Kumar Sarvasiddi
 
Fbdl enabling comprehensive_data_services
Fbdl enabling comprehensive_data_servicesFbdl enabling comprehensive_data_services
Fbdl enabling comprehensive_data_services
Cindy Irby
 
data_blending
data_blendingdata_blending
data_blendingsubit1615
 
Data warehouse
Data warehouseData warehouse
Data warehouseMR Z
 
Increasing Agility Through Data Virtualization
Increasing Agility Through Data VirtualizationIncreasing Agility Through Data Virtualization
Increasing Agility Through Data Virtualization
Denodo
 
Data Mesh in Azure using Cloud Scale Analytics (WAF)
Data Mesh in Azure using Cloud Scale Analytics (WAF)Data Mesh in Azure using Cloud Scale Analytics (WAF)
Data Mesh in Azure using Cloud Scale Analytics (WAF)
Nathan Bijnens
 
Save costs by using IBM Tivoli Storage Manager
Save costs by using IBM Tivoli Storage ManagerSave costs by using IBM Tivoli Storage Manager
Save costs by using IBM Tivoli Storage Manager
IBM Software India
 

Similar to Introduction to the Query-driven Approach (20)

Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docxChapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
 
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docxChapter 3Data Management,Big Data Analytics, andRecords Ma.docx
Chapter 3Data Management,Big Data Analytics, andRecords Ma.docx
 
Business Intelligence Solution on Windows Azure
Business Intelligence Solution on Windows AzureBusiness Intelligence Solution on Windows Azure
Business Intelligence Solution on Windows Azure
 
BVRM 402 IMS UNIT V
BVRM 402 IMS UNIT VBVRM 402 IMS UNIT V
BVRM 402 IMS UNIT V
 
BVRM 402 IMS Database Concept.pptx
BVRM 402 IMS Database Concept.pptxBVRM 402 IMS Database Concept.pptx
BVRM 402 IMS Database Concept.pptx
 
The Joy Of Bits
The  Joy  Of  BitsThe  Joy  Of  Bits
The Joy Of Bits
 
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWA
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWADecember 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWA
December 2015 - TDWI Checklist Report - Seven Best Practices for Adapting DWA
 
The Data Warehouse Essays
The Data Warehouse EssaysThe Data Warehouse Essays
The Data Warehouse Essays
 
Data Warehouse
Data WarehouseData Warehouse
Data Warehouse
 
Dit yvol2iss27
Dit yvol2iss27Dit yvol2iss27
Dit yvol2iss27
 
Data Mesh using Microsoft Fabric
Data Mesh using Microsoft FabricData Mesh using Microsoft Fabric
Data Mesh using Microsoft Fabric
 
Bi
BiBi
Bi
 
Data warehouse-testing
Data warehouse-testingData warehouse-testing
Data warehouse-testing
 
Oracle sql plsql & dw
Oracle sql plsql & dwOracle sql plsql & dw
Oracle sql plsql & dw
 
Fbdl enabling comprehensive_data_services
Fbdl enabling comprehensive_data_servicesFbdl enabling comprehensive_data_services
Fbdl enabling comprehensive_data_services
 
data_blending
data_blendingdata_blending
data_blending
 
Data warehouse
Data warehouseData warehouse
Data warehouse
 
Increasing Agility Through Data Virtualization
Increasing Agility Through Data VirtualizationIncreasing Agility Through Data Virtualization
Increasing Agility Through Data Virtualization
 
Data Mesh in Azure using Cloud Scale Analytics (WAF)
Data Mesh in Azure using Cloud Scale Analytics (WAF)Data Mesh in Azure using Cloud Scale Analytics (WAF)
Data Mesh in Azure using Cloud Scale Analytics (WAF)
 
Save costs by using IBM Tivoli Storage Manager
Save costs by using IBM Tivoli Storage ManagerSave costs by using IBM Tivoli Storage Manager
Save costs by using IBM Tivoli Storage Manager
 

Recently uploaded

Opendatabay - Open Data Marketplace.pptx
Opendatabay - Open Data Marketplace.pptxOpendatabay - Open Data Marketplace.pptx
Opendatabay - Open Data Marketplace.pptx
Opendatabay
 
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
yhkoc
 
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
axoqas
 
Best best suvichar in gujarati english meaning of this sentence as Silk road ...
Best best suvichar in gujarati english meaning of this sentence as Silk road ...Best best suvichar in gujarati english meaning of this sentence as Silk road ...
Best best suvichar in gujarati english meaning of this sentence as Silk road ...
AbhimanyuSinha9
 
一比一原版(UofS毕业证书)萨省大学毕业证如何办理
一比一原版(UofS毕业证书)萨省大学毕业证如何办理一比一原版(UofS毕业证书)萨省大学毕业证如何办理
一比一原版(UofS毕业证书)萨省大学毕业证如何办理
v3tuleee
 
Q1’2024 Update: MYCI’s Leap Year Rebound
Q1’2024 Update: MYCI’s Leap Year ReboundQ1’2024 Update: MYCI’s Leap Year Rebound
Q1’2024 Update: MYCI’s Leap Year Rebound
Oppotus
 
My burning issue is homelessness K.C.M.O.
My burning issue is homelessness K.C.M.O.My burning issue is homelessness K.C.M.O.
My burning issue is homelessness K.C.M.O.
rwarrenll
 
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
Timothy Spann
 
一比一原版(QU毕业证)皇后大学毕业证成绩单
一比一原版(QU毕业证)皇后大学毕业证成绩单一比一原版(QU毕业证)皇后大学毕业证成绩单
一比一原版(QU毕业证)皇后大学毕业证成绩单
enxupq
 
Malana- Gimlet Market Analysis (Portfolio 2)
Malana- Gimlet Market Analysis (Portfolio 2)Malana- Gimlet Market Analysis (Portfolio 2)
Malana- Gimlet Market Analysis (Portfolio 2)
TravisMalana
 
Influence of Marketing Strategy and Market Competition on Business Plan
Influence of Marketing Strategy and Market Competition on Business PlanInfluence of Marketing Strategy and Market Competition on Business Plan
Influence of Marketing Strategy and Market Competition on Business Plan
jerlynmaetalle
 
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
slg6lamcq
 
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
dwreak4tg
 
一比一原版(NYU毕业证)纽约大学毕业证成绩单
一比一原版(NYU毕业证)纽约大学毕业证成绩单一比一原版(NYU毕业证)纽约大学毕业证成绩单
一比一原版(NYU毕业证)纽约大学毕业证成绩单
ewymefz
 
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
u86oixdj
 
Empowering Data Analytics Ecosystem.pptx
Empowering Data Analytics Ecosystem.pptxEmpowering Data Analytics Ecosystem.pptx
Empowering Data Analytics Ecosystem.pptx
benishzehra469
 
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
John Andrews
 
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
ewymefz
 
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
vcaxypu
 
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
Subhajit Sahu
 

Recently uploaded (20)

Opendatabay - Open Data Marketplace.pptx
Opendatabay - Open Data Marketplace.pptxOpendatabay - Open Data Marketplace.pptx
Opendatabay - Open Data Marketplace.pptx
 
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
一比一原版(CU毕业证)卡尔顿大学毕业证成绩单
 
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
做(mqu毕业证书)麦考瑞大学毕业证硕士文凭证书学费发票原版一模一样
 
Best best suvichar in gujarati english meaning of this sentence as Silk road ...
Best best suvichar in gujarati english meaning of this sentence as Silk road ...Best best suvichar in gujarati english meaning of this sentence as Silk road ...
Best best suvichar in gujarati english meaning of this sentence as Silk road ...
 
一比一原版(UofS毕业证书)萨省大学毕业证如何办理
一比一原版(UofS毕业证书)萨省大学毕业证如何办理一比一原版(UofS毕业证书)萨省大学毕业证如何办理
一比一原版(UofS毕业证书)萨省大学毕业证如何办理
 
Q1’2024 Update: MYCI’s Leap Year Rebound
Q1’2024 Update: MYCI’s Leap Year ReboundQ1’2024 Update: MYCI’s Leap Year Rebound
Q1’2024 Update: MYCI’s Leap Year Rebound
 
My burning issue is homelessness K.C.M.O.
My burning issue is homelessness K.C.M.O.My burning issue is homelessness K.C.M.O.
My burning issue is homelessness K.C.M.O.
 
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
06-04-2024 - NYC Tech Week - Discussion on Vector Databases, Unstructured Dat...
 
一比一原版(QU毕业证)皇后大学毕业证成绩单
一比一原版(QU毕业证)皇后大学毕业证成绩单一比一原版(QU毕业证)皇后大学毕业证成绩单
一比一原版(QU毕业证)皇后大学毕业证成绩单
 
Malana- Gimlet Market Analysis (Portfolio 2)
Malana- Gimlet Market Analysis (Portfolio 2)Malana- Gimlet Market Analysis (Portfolio 2)
Malana- Gimlet Market Analysis (Portfolio 2)
 
Influence of Marketing Strategy and Market Competition on Business Plan
Influence of Marketing Strategy and Market Competition on Business PlanInfluence of Marketing Strategy and Market Competition on Business Plan
Influence of Marketing Strategy and Market Competition on Business Plan
 
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
一比一原版(UniSA毕业证书)南澳大学毕业证如何办理
 
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
一比一原版(BCU毕业证书)伯明翰城市大学毕业证如何办理
 
一比一原版(NYU毕业证)纽约大学毕业证成绩单
一比一原版(NYU毕业证)纽约大学毕业证成绩单一比一原版(NYU毕业证)纽约大学毕业证成绩单
一比一原版(NYU毕业证)纽约大学毕业证成绩单
 
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
原版制作(Deakin毕业证书)迪肯大学毕业证学位证一模一样
 
Empowering Data Analytics Ecosystem.pptx
Empowering Data Analytics Ecosystem.pptxEmpowering Data Analytics Ecosystem.pptx
Empowering Data Analytics Ecosystem.pptx
 
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
Chatty Kathy - UNC Bootcamp Final Project Presentation - Final Version - 5.23...
 
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
一比一原版(UPenn毕业证)宾夕法尼亚大学毕业证成绩单
 
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
一比一原版(ArtEZ毕业证)ArtEZ艺术学院毕业证成绩单
 
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
Levelwise PageRank with Loop-Based Dead End Handling Strategy : SHORT REPORT ...
 

Introduction to the Query-driven Approach

  • 2.  Information technology specialist and executive leader Timothy Valihora is the president of TVMG Consulting. A certified IBM Information Server Expert, Timothy Valihora provides consulting services to firms seeking software, system management, and server solutions. A data warehouse is a collection of historical data containing raw material that is used to help analysts and executives with administration, creating reports, mining data, and making corporate decisions. When integrating heterogeneous databases for the construction of a data warehouse, the two common approaches include the update-driven approach and the query-driven approach.
  • 3.  Also referred to as the “lazy integration” approach, the query-driven approach is used to construct integrators, known as “mediators,” and wrappers onto several heterogeneous databases. Due to the minimal storage requirement, this approach results in less space and less drainage on its sources. Additionally, the approach still functions when the query needs are not known. However, the query-driven approach requires complex filtering and integrating processes, and is therefore less efficient than its counterpart the update-driven approach. Thus, the query-driven approach often results in higher costs when frequent queries or aggregations are involved.