Files:DescriptionFile size FormatBrowse
Fulltext0.55 MBPDF (requires Acrobat Reader)Previous | Next
PostScript
  
Authors:Sarah Mallet: IRISA/INSA, Campus Universitaire de Beaulieu, France
Mireille Ducassé: IRISA/INSA, Campus Universitaire de Beaulieu, France
Publication title:DDB Trees: A Basis for Deductive Database Explanations
Conference:Proceedings of the 3rd International Workshop on Automatic Debugging, 1997 (AADEBUG-97)
Publication type: Abstract and Fulltext
Issue:001
Article No.:009
Abstract:The power of deductive systems in general is that programs express what should be done and not how it should be done. Nevertheless, deductive systems need debugging and explanation facilities. Indeed, their operational semantics is less abstract than the declarative semantics of the programs. If users have to understand all the low level details of the operational semantics much of the benefits of using a deductive system is lost.

Existing explanation systems for deductive databases produce proof trees to be shown to users. Although useful, proof trees give a fragmented view of query evaluations, and users face a, most of the time large, forest of proof trees.

We propose a new data structure, called the DDB tree, which merges the information of a proof tree forest into one concise tree. A DDB tree gives a global picture of a query evaluation in a dramatically reduced structure with no loss of information. DDB trees can be shown to users or can be analyzed further by an explanation system.

Language:English
Keywords:debugging, explanations, deductive databases, logic programming
Year:1997
No. of pages:16
Pages:87-102
Series:Linköping Electronic Conference Proceedings
ISSN (print):1650-3686
ISSN (online):1650-3740
File:http://www.ep.liu.se/ea/cis/1997/009/09/cis9700909.pdf
Available:1997-09-10
Publisher:Linköping University Electronic Press, Linköpings universitet

REFERENCE TO THIS PAGE
Sarah Mallet, Mireille Ducassé (1997). DDB Trees: A Basis for Deductive Database Explanations, Proceedings of the 3rd International Workshop on Automatic Debugging, 1997 (AADEBUG-97) http://www.ep.liu.se/ecp_article/index.en.aspx?issue=001;article=009 (accessed 4/19/2014)