Database Concepts (8th Edition)
Database Concepts (8th Edition)
8th Edition
ISBN: 9780134601533
Author: David M. Kroenke, David J. Auer, Scott L. Vandenberg, Robert C. Yoder
Publisher: PEARSON
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Chapter 6, Problem 6.13RQ
Program Plan Intro

Locks:

In order to avoid accessing the content or obtaining the copies of the same rows or table by multiple applications, a technique called resource locking is used to overcome this problem.

Resource locking is technique which prevents the concurrent processing problems which blocks the sharing of resources or databy locking the resources or data.

There are two types of lock available to prevent concurrent processing problems:

  • Explicit Locks - The locks which are performed by the DBMS are called implicit locks.
  • Implicit Locks - The locks which are performed by command are called as explicit locks

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8. Name and Email AddressesWrite a program that keeps names and email addresses in a dictionary as key-value pairs. The program should display a menu that lets the user look up a person’s email address, add a new name and email address, change an existing email address, and delete an existing name and email address. The program should pickle the dictionary and save it to a file when the user exits the program. Each time the program starts, it should retrieve the dictionary from the file and unpickle it.   How would the user be able to use the program?
Please solve and answer the question correctly please. Thank you!!
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