10. Hash Table size = 13 Hash Function = H (x) = x mod 13 Collision Resolution = Quadratic probing = h+i? %3D Keys 10, 100, 32, 45, 58, 126, 3, 29, 200, 400, 0, 21, 15. Pickup the correct statement: P: The Key '58’ is stored at location: 10 Q: The Key '126’ is stored at location: 9 R: The Key '0' is stored at location: 0 S: The Key 10' is stored at location: 11 T: The Key 15' is stored at location: 12 U: The Key 400' is stored at location: 10 V: The Key '29' is stored åt location: 3

10. Hash Table size = 13 Hash Function = H (x) = x mod 13 Collision Resolution = Quadratic probing = h+i? %3D Keys 10, 100, 32, 45, 58, 126, 3, 29, 200, 400, 0, 21, 15. Pickup the correct statement: P: The Key '58’ is stored at location: 10 Q: The Key '126’ is stored at location: 9 R: The Key '0' is stored at location: 0 S: The Key 10' is stored at location: 11 T: The Key 15' is stored at location: 12 U: The Key 400' is stored at location: 10 V: The Key '29' is stored åt location: 3

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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1. Given the following hash function for storing records on courses:f(title) = ASCII value of first character in the title - 64Example: f(Biology I) = 66 – 65 = 1 (ASCII value of B is 66) a. Explain why this is or is not a good hash function.b. What improvement(s) could be made? 2. Assume that the hash function is: f(key) = key % Ba. What is the problem if B is too small?b. What is the problem if B is too large?c. What is the big-0 run-time if there are n records?d. What does the run-time for a find, insert, and delete each approach as B gets verylarge?
Use C++ Programming language. The header file below defines a class for a simple hash table: hashMap.h Download hashMap.h Write a driver program to test the class with the following data: (520, "3100 Main St, Houston TX "); (37, "2200 Hayes Rd, Austin TX"); (226, "1775 West Airport St, San Antonio TX"); (273, "3322 Walnut Bend, Houston TX"); (491, "5778 Alabama, Waco TX"); (94, "3333 New St, Paris TX"); Make sure to test the find function for exiting and non-existing data 2. Modify the type of member key in class HashEntry from int to a string (this is useful is the key is e.g. the phone number or e-mail address). Use the string hash function discussed in class (see ppt notes) or search online for alternative functions that work on strings. 3. Modify the collision strategy of class HashMap to do separate chaining instead of linear probing. Be sure to modify the display function so that items in the bucket chains are also displayed in a pre-defined order…
#7. HashTable Data Type: By having each bucket contain a linked list of elements that are hashed to that bucket. Usage: >>> table = SeparateChainingHashTable() # Create a new, empty map. >>> table.put('hello', 'world') # Add a new key-value pair. >>> len(table) # Return the number of key-value pairs stored in the map. 1 >>> table.get('hello') # Get value by key. 'world' >>> del table['hello'] # Equivalent to `table.del_('hello')`, deleting key-value pair. >>> table.get('hello') is None # Return `None` if a key doesn't exist. True """ _empty = None def __init__(self, size=11): self.size = size self._len = 0 self._table = [self._empty] * size def put(self, key, value): hash_ = self.hash(key) node_ = self._table[hash_] if node_ is self._empty: self._table[hash_] = Node(key, value) else: while node_.next is not None:…
1. A hashing function converts a large ___ to a small ___. 2. A ___ occurs when two keys hash to the same address. 3. For an open hashing scheme, the records within each bucket are stored in key order ( true / false ). 4. For an open hashing scheme, the most recently inserted record will be on the front end of the bucket list ( true / false )
A hash table is a very important data structure in computer science. It is used for fast information retrieval. Itstores data as a < key, value > pair, where the value is indexed by the key. Note that keys must ne unique.Consider the example of storing persons name using the social security number (ssn) as the key. For eachssn x, a hash function h is used, where h(x) is the location to store the name of x. Once we have created atable, to look up the name for ssn x, we can recomputes h(x) and then look up what is stored in that location.In Python, dictionaries are based on hash tables. Typically, the hash function h is deterministic; we do notwant to get different results every time we compute h(x). But h is often chosen to be pseudo-random. Forthis problem, we will assume that h is truly random. Suppose there are k people, with each person’s namestored in a random location (independently), represented by an integer between 1 and n, k < n. It mayhappen that one location has…
import hashlib def hash_function(password, salt, al): if al == 'md5': #md5 hash = hashlib.md5(salt.encode() + password.encode()) hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif (al == 'sha1'): #sha1 hash = hashlib.sha1() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'sha224': #sha224 hash = hashlib.sha224() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'sha256': #sha256 hash = hashlib.sha256() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt elif al == 'blake2b': #blake2b512 hash = hashlib.blake2b() hash.update(password.encode('utf-8')) return hash.hexdigest() + ':' + salt else: print("Error: No Algorithm!") if __name__ == "__main__": # TODO: create a list called hash_list that contains # the five hashing algorithsm as strings # md5, sha1, sha224, sha256, blake2b hash_list =…
Calculate the final hash values for following keys, k={5,25,45}, given the hash function below: hi(k)=(hash1(k)+(i×hash2(k))) mod 20 hash1(k)=(k+2) mod 20 hash2(k)=17-(k mod 17)
A hash function is bi-directional, it allows us to create a fingerprint of a file and also reverse the processes to get the contents of the file Group of answer choices True False
TODO: Create a hash function and compute the index of a user using both the first and last names.
using C++ Program – Define a suitable hash function and store the data in a hash table using linear probing. Set the size of the hash table to be 50% more than the size of the data sets. Record the time to insert all data into the hash table. Test the search function using the search data and record the timing of the searches. note : Note: the data sets is string type, defined an int key
Write a program that will use the hash function “H (key) =key mod 20” to create bank application that stores the below information of customer in the hash table of size =20. Account Number (Key) must be 4 digits value and generated by user defined random function .Compare its performance with linear probing, quadratic probing. If you use “cubic probing”; here the ith probe is at hash(x) + i3 . Does cubic probing improve the performance over linear probing and quadratic probing?  key  name  account title  balance  status
Cuckoo hashing. Develop a symbol-table implementation that maintains twohash tables and two hash functions. Any given key is in one of the tables, but not both. When inserting a new key, hash to one of the tables; if the table position is occupied, replace that key with the new key and hash the old key into the other table (again kicking out a key that might reside there). If this process cycles, restart. Keep the tables less than half full. This method uses a constant number of equality tests in the worst case for search (trivial) and amortized constant time for insert.