NDLI: Relational and Entity-Relationship Model Databases and Specialized Design Files in VLSI Design

Content Provider	IEEE Xplore Digital Library
Author	Wilkins, M.W. Berlin, R. Payne, T. Wiederhold, G.
Copyright Year	1985
Description	Author affiliation: Computer Science Department, Stanford University, Stanford, CA (Wilkins, M.W.)
Abstract	Databases have a number of advantages over specialized design files for use in the VLSI design process. Balanced against these advantages is the presumed extra run-time cost of accessing the database. In particular, ordinary relational databases appear to be too slow to be used on-line by engineers in the design process [Eastman80] [Haynie81] [Sidle80] [Stonebraker82]. The requirements for design access include the retrieval of major units of data at one time, implying joins of many attributes with their libraries, and projections to obtain the relevant attributes for a given study. Previously, in order to test if databases could achieve acceptable performance at all, we experimented using a CODASYL database system [Beetem82] [Wiederhold82]. This appeared to provide adequate performance, but at a high cost of software maintenance and lack of flexibility due to CODASYL limitations. Our hypothesis is that the relational data model per se is not the crucial factor in performance; rather, the internal access mechanisms of the database significantly affect performance. To test this hypothesis, we ran experiments using the Cypress database system in the Cedar environment at Xerox Palo Alto Research Center. The program used is a design macro expander, more fully described in Section 3. The tests show that colocating pointers to all relations that a VLSI component appears in will reduce CPU time spent in the main database access routines by 25%. We repeated a subset of these experiments on a Digital VAX 750 using the Structured Design System (SDS) of Silvar-Lisco [SL83] with specialized design files rather than a database management system, and found that when a structured result file is used, the largest component of execution time is the time spent writing out the expansion results.
Starting Page	410
Ending Page	416
File Size	776440
Page Count	7
File Format	PDF
ISBN	0818606355
ISSN	0738100X
DOI	10.1109/DAC.1985.1585973
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1985-06-23
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Relational databases Very large scale integration Database systems Process design Costs System testing Runtime Data engineering Design engineering Information retrieval
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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