NDLI: Scalable view expansion in a peer mediator system

Content Provider	IEEE Xplore Digital Library
Author	Katchaounov, T. Josifovski, V. Risch, T.
Copyright Year	2003
Description	Author affiliation: Uppsala Univ., Sweden (Katchaounov, T.)
Abstract	To integrate many data sources we use a peer mediator-framework where views defined in the peers are logically composed in terms of each other A common approach to execute queries over mediators is to treat views in data sources as 'black boxes'. The mediators locally decompose queries into query fragments and submit them to the data sources for processing. Another approach, used in distributed DBMSs, is to treat the views as 'transparent boxes' by importing and fully expanding all views and merge them with the query. The black box approach often leads to inefficient query plans. However, in a peer mediator framework full view expansion (VE) leads to prohibitively long query compilation times when many peers are involved. It also limits peer autonomy since peers must reveal their view definitions. We investigate in a peer mediator framework the tradeoffs between none, partial, and full VE in two different distributed view composition scenarios. We show that it is often favorable with respect to query execution and sometimes even with respect to query compilation time to expand those views having common hidden peer subviews. However, in other cases it is better to use the 'black box' approach, in particular when peer autonomy prohibits view importation. Based on this, a hybrid strategy for VE in peer mediators is proposed.
Sponsorship	Commun. Res. Lab. Hitachi Kyoto Univ
Starting Page	107
Ending Page	116
File Size	351944
Page Count	10
File Format	PDF
ISBN	0769518958
DOI	10.1109/DASFAA.2003.1192374
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2003-03-26
Publisher Place	Japan
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	File servers Data models Computer architecture Application software Web and internet services Mediation Large scale integration Query processing Web server Costing
Content Type	Text
Resource Type	Article

Sl.	Authority	Responsibilities	Communication Details
1	Ministry of Education (GoI), Department of Higher Education	Sanctioning Authority	https://www.education.gov.in/ict-initiatives
2	Indian Institute of Technology Kharagpur	Host Institute of the Project: The host institute of the project is responsible for providing infrastructure support and hosting the project	https://www.iitkgp.ac.in
3	National Digital Library of India Office, Indian Institute of Technology Kharagpur	The administrative and infrastructural headquarters of the project	Dr. B. Sutradhar bsutra@ndl.gov.in
4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
5	Website/Portal (Helpdesk)	Queries regarding NDLI and its services	support@ndl.gov.in
6	Contents and Copyright Issues	Queries related to content curation and copyright issues	content@ndl.gov.in
7	National Digital Library of India Club (NDLI Club)	Queries related to NDLI Club formation, support, user awareness program, seminar/symposium, collaboration, social media, promotion, and outreach	clubsupport@ndl.gov.in
8	Digital Preservation Centre (DPC)	Assistance with digitizing and archiving copyright-free printed books	dpc@ndl.gov.in
9	IDR Setup or Support	Queries related to establishment and support of Institutional Digital Repository (IDR) and IDR workshops	idr@ndl.gov.in

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