Relational Database Management System Mcqs

Page No. 33

If a relation can have more than one record containing the same search key value, the search key is said to be a __________


a Unique search key


b Non unique search key


cMultiple search key


dIdentical search key



Statement 1: Insertion of record might require the change in position of the initial nodes. Statement 2: Deletion of records might require the change in position of the initial nodes.


a Both the statements are true


bStatement 1 is true but statement 2 is false


cStatement 2 is true but statement 1 is false


dBoth the statements are false



The queries used to find all records with search key values in a particular range are known as ________


aGap queries


bGraph queries


cRange queries


dNone of the mentioned


View Answer Range queries

Non-leaf nodes are also called as __________


aInternal nodes


bExternal nodes


cMiddle nodes


dPrimary nodes


View Answer Internal nodes

What are the leaf nodes in a B+ tree?


aThe topmost nodes


b The bottommost nodes


cThe nodes in between the top and bottom nodes


d None of the mentioned



State true or false: B+ trees are not always balanced trees.


aTrue


bFalse


ceither true of false


dnone of these


View Answer False

State true or false: Hash indices are only primary index structures


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

Which of the following is the worst hash function among the given choices


a The sum of the digits modulo 8


bThe sum of the digits modulo 2


c The sum of the digits modulo 5


dThe sum of the digits


View Answer The sum of the digits

State true or false: A hash index organizes the search keys, with their associated pointers, into a hash file structure


aTrue


bFalse


ceither true of false


dnone of these


View Answer True

Overflow handling using a linked list of buckets is called as ____________


a Bucket chaining


bOverflow chaining


cBucket linking


dOverflow linking


View Answer Overflow chaining

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