NDLI: A linear-time scheme for version reconstruction

Content Provider	ACM Digital Library
Author	Yu, Lin Rosenkrantz, Daniel J.
Copyright Year	1994
Abstract	An efficient scheme to store and reconstruct versions of sequential files is presented. The reconstruction scheme involves building a data structure representing a complete version, and then successively modifying this data structure by applying a sequence of specially formatted differential files to it. Each application of a differential file produces a representation of an intermediate version, with the final data structure representing the requested version.The scheme uses a linked list to represent an intermediate version, instead of a sequential array, as is used traditionally. A new format for differential files specifying changes to this linked list data structure is presented. The specification of each change points directly to where the change is to take place, thereby obviating a search. Algorithms are presented for using such a new format differential file to transform the representation of a version, and for reconstructing a requested version. Algorithms are also presented for generating the new format differential files, both for the case of a forward differential specifying how to transform the representation of an old version to the representation of a new version, and for the case of a reverse differential specifying how to transform the representation of a new version to the representation of an old version.The new version reconstruction scheme takes time linear in the sum of the size of the initial complete version and the sizes of the file differences involved in reconstructing the requested version. In contrast, the classical scheme for reconstructing versions takes time proportional to the sum of the sizes of the sequence of versions involved in the reconstruction, and therefore has a worst-case time that is quadratic in the sum of the size of the initial complete version and the sizes of the file differences. The time cost of the new differential file generation scheme is comparable to the time cost of the classical differential file generation scheme.
Starting Page	775
Ending Page	797
Page Count	23
File Format	PDF
ISSN	01640925
e-ISSN	15584593
DOI	10.1145/177492.177705
Volume Number	16
Issue Number	3
Journal	ACM Transactions on Programming Languages and Systems (TOPLAS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	1994-05-01
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Data structures Database systems Differential files Document preparation Software systems Textual objects Version control
Content Type	Text
Resource Type	Article
Subject	Software

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

A local semi-supervised Sammon algorithm for textual data visualization

A data model and data structures for moving objects databases

Differential files: their application to the maintenance of large databases

The performance of three database storage structures for managing large objects

Companson and Diagnosis of Large Replicated Files

A multidimensional digital hashing scheme for files with composite keys

An Indexing Method for Answering Queries on Moving Objects

Textual Data Mining to Support Science and Technology Management

Migrating Autonomous Objects in a WAN Environment

A linear-time scheme for version reconstruction

Similar Documents

A local semi-supervised Sammon algorithm for textual data visualization

A data model and data structures for moving objects databases

Differential files: their application to the maintenance of large databases

The performance of three database storage structures for managing large objects

Companson and Diagnosis of Large Replicated Files

A multidimensional digital hashing scheme for files with composite keys

An Indexing Method for Answering Queries on Moving Objects

Textual Data Mining to Support Science and Technology Management

Migrating Autonomous Objects in a WAN Environment

A linear-time scheme for version reconstruction