For the following values, explain whether we can efficiently get the value from a default (standard) inverted index postings file. By efficiently we mean with one lookup--not scanning the entire index. Symbol Value |d| total number of terms in a given doc "|p| df(w) number of unique terms in a given doc number of documents term w appears in c(w, C) number of times term w occurs in corpus C c(w, d) number of times term w occurs in document d p(w, d) probability of term w occurring in document i

For the following values, explain whether we can efficiently get the value from a default (standard) inverted index postings file. By efficiently we mean with one lookup--not scanning the entire index. Symbol Value |d| total number of terms in a given doc "|p| df(w) number of unique terms in a given doc number of documents term w appears in c(w, C) number of times term w occurs in corpus C c(w, d) number of times term w occurs in document d p(w, d) probability of term w occurring in document i

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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Question

For the following values, explain whether we can
efficiently get the value from a default (standard) inverted
index postings file. By efficiently we mean with one
lookup--not scanning the entire index.
Symbol
Value
|d|
total number of terms in a given doc
|dlu
number of unique terms in a given doc
df(w)
number of documents term w appears in
c(w, C)
number of times term w occurs in corpus C
c(w, d)
number of times term w occurs in document d
p(w, d)
probability of term w occurring in document i

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