Typical hash functions are not perfect becausethey allow more than one hash key to map to the same indexthey allow collisionsboth a and bnone of the answers Using a second hash function to compute increments for probeincrements is calledQuadratic probingsecondary probingdouble hashingrehashing

Using a second hash function to compute increments for probe increments is calledCorrect option is (c) " double hashing", because in the double hashing it is a collision removal technique. It uses the idea of applying a second hash function to keys when collision occur. And also it uses second hash function to compute increments in a key independent way.Typical hash functions are not perfect becauseCorrect option is (c) " both a and b", because Typical hash functions are not perfect due to collision which may occur the chances of more than one hash key to map to the same index.

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Using a second hash function to compute increments for probe increments is called

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

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Concept explainers

Hash Table

A hash table also called a hash map, is a data structure that maps key-value pairs. The hash table can be used in complex systems to provide fast access and compact storage. A hash table is a structure that stores data in an abstract data type kind of associative array. It keeps data in an array format, with a distinct index value for every data value. If the index of the required data is known, then the data can be accessed very easily.

Question

Typical hash functions are not perfect because
they allow more than one hash key to map to the same index
they allow collisions
both a and b
none of the answers

Using a second hash function to compute increments for probe
increments is called
Quadratic probing
secondary probing
double hashing
rehashing

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