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Recommend a query processing order for

Recommend a query processing order for

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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IS 476 IS 476 Exercise Recommend a query processing order for (tangerine OR trees) AND (marmalade OR skies) AND (kaleidoscope OR eyes) . Which two terms should we process first? Term eyes kaleidoscope marmalade skies tangerine trees Freq 213312 87009 107913 271658 46653 316812 Query processing exercises Exercise: If the query is friends AND romans AND (NOT countrymen), how could we use the freq of countrymen? • Exercise: Extend the merge to an arbitrary Boolean query. Can we always guarantee execution in time linear in the total postings size? Hint: Begin with the case of a Boolean formula query: in this, each query term appears only once in the query.
Transcribed Image Text:IS 476 IS 476 Exercise Recommend a query processing order for (tangerine OR trees) AND (marmalade OR skies) AND (kaleidoscope OR eyes) . Which two terms should we process first? Term eyes kaleidoscope marmalade skies tangerine trees Freq 213312 87009 107913 271658 46653 316812 Query processing exercises Exercise: If the query is friends AND romans AND (NOT countrymen), how could we use the freq of countrymen? • Exercise: Extend the merge to an arbitrary Boolean query. Can we always guarantee execution in time linear in the total postings size? Hint: Begin with the case of a Boolean formula query: in this, each query term appears only once in the query.
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