
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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What is the time complexity of insert function in a hash table using a doubly linked list?
a) O(1)
b) O(n)
c) O(log n)
d) O(n log n)
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- In what ways does the usage of a hash table increase efficiency over the use of a linear list? What may be the problem?The usage of a hashtable in its designarrow_forwardif we compare a hash table performanve with a binary search of a sorted array, the number od comparisons required by a hash table vs the binary search tree is _____ A) O(1) vs O(n) B) O(n) vs O(1) c) O(n^2) vs O(log n) d) O(1) vs O(log n) e) O(n) vs O(n)arrow_forwardHow can hashing be used to determine if all elements in a list are unique? What is the complexity?arrow_forward
- Given a sequence of 5 keys < 53, 66, 32, 41, 88 > for searching task: a) Given the hash function H(k) = (3.k) mod 7, insert the keys above according to its original order (from left to right) into a hash table of 7 slots. Indicate the cases of collision. Clearly show the steps and calculation with a table. b) In case of any collisions found above in a) part, determine the new slot for each collided case using Linear Probing to solve the collision problem. Clearly show your answer for each identified case. No step of calculation required. o (Answer with “NO collision found”, in case there is no collisions found above) c) In case of any collisions found above in a) part, determine the new slot ONLY for the first collided case using Double-Hashing (with functions below) to solve the collision problem. Clearly show the steps of your calculation. d1 = H(k) = (3.k) mod 7 di = (di−1 + ((5·k) mod 6) + 1) mod 7 , i ≥ 2 o (Answer with “NO collision found”, in case there is no collisions…arrow_forwardTask - 1: Write a java program to implement the following algorithms for Open Addressing techniques for Hash Table data structure. (Use a simple array of integers to store integer key values only). HASH-SEARCH(T, k) HASH-INSERT (T, k) i = 0 repeat j = h (k, i) if T[j] == NIL T[j] = k return j else i = i + 1 ● i = 0 repeat until i == m error “hash table overflow" For both algorithms, to compute the index j, write the following methods: getLinear ProbIndex (key, i) getQuadraticProbIndex ● get DoubleHash (key, i) (key, i) j = h (k, i) if T[j] == k return j i = i + 1 until T[j] == NIL or i = m return NIL Linear Probing index is computed using following hash function: h(k, i) = (h₁(k) + i) mod m h₁(k)= k mod m Quadratic probing index is computed using following hash function: h(k, i) = (h₁(k) + i²) mod m h₁(k)= k mod m Double hashing index is computed using following hash function: h(k, i) = (h₁(k) + i h₂(k)) mod m h₁(k)= k mod m h₂(k) = 1 + (k mod m - 1)arrow_forwardIn the worst case, the number of comparisons needed to search a singly linked list of length n for a given element is?a) log2 nb) n⁄2c) log2 n – 1d) narrow_forward
- Insert the following sequence of keys in the hash table.Keys = {4, 2, 1, 3, 5, 6, 8}Use linear probing technique for collision resolution: h(k, i) = [h(k) + i] mod mHash function, h(k) = 3k + 1Table size, M = 10 Draw the hash table, compute the index where the hashvalue will be inserted for each key, and show how you would use the technique when a collisionoccurs.arrow_forwardWhat is the time complexity of delete function in the hash table using a doubly linked list?a) O(1)b) O(n)c) O(log n)d) O(n log n)arrow_forwardHow can a hash table improve efficiency over a linear list? Problem?arrow_forward
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