Starting Out with Python (4th Edition)
4th Edition
ISBN: 9780134444321
Author: Tony Gaddis
Publisher: PEARSON
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Chapter 7, Problem 8TF
You can remove an element from a tuple by calling the tuple's remove method.
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A new application is being developed and will be using a database that includes a relation about items: Item (item_id:integer, item_name:string, color:string, price:real).
Both the purchasing department in charge of obtaining raw material and the manufacturing department in charge of manufacturing the items can change the price of manufactured items according to changes that may happen in the raw material cost or production cost. The two departments use different transactions to update the price of items. The new application uses the following sequences of actions, listed in the order they are submitted to the DBMS:
Sequence S1: T1:R(X), T2:W(X), T2:W(Y), T3:W(Y), T1:W(Y), T1:Commit, T2:Commit, T3:Commit
Sequence S2: T1:R(X), T2:W(Y), T2:W(X), T3:W(Y), T1:W(Y), T1:Commit, T2:Commit, T3:Commit
For each of the following concurrency control mechanisms, describe how they will handle each of the sequences (S1 & S2).
Strict 2PL with timestamps used for deadlock prevention.
Conservative…
As a database administrator of a large manufacturing organization, you are in charge of their website database that handles suppliers, parts, catalog, customers, and payments of delivered items. The following relations are part of the large database:
Supplier(SID, Sname, Saddress, Stelephone)Customer(CID, Cname, Caddress, Ctelephone)Part(PID, Pname, Pmodel, Pcolor)Catalog(SID, PID, Price)
(The Catalog relation lists the prices charged for parts by Suppliers).
Because the application is web-based and the database is accessed by many users, you want to increase the concurrency usage without compromising the data quality. For each of the following transactions, state the minimum SQL isolation level you would use in order to avoid any conflict problems in them. Please explain your choice.
A transaction that adds a new part to a supplier’s catalog.
A transaction that increases the price that a supplier charges for a part.
A transaction that determines the total number of items for a given…
Please no AI! Or if you do use AI, Check the work please! Thank you!
Chapter 7 Solutions
Starting Out with Python (4th Edition)
Ch. 7.2 - What will the following code display? numbers =...Ch. 7.2 - Prob. 2CPCh. 7.2 - Prob. 3CPCh. 7.2 - Prob. 4CPCh. 7.2 - Prob. 5CPCh. 7.2 - Prob. 6CPCh. 7.2 - Prob. 7CPCh. 7.2 - Prob. 8CPCh. 7.3 - Prob. 9CPCh. 7.3 - Prob. 10CP
Ch. 7.3 - Prob. 11CPCh. 7.3 - Prob. 12CPCh. 7.3 - Prob. 13CPCh. 7.4 - What will the following code display? names =...Ch. 7.5 - Prob. 15CPCh. 7.5 - Prob. 16CPCh. 7.5 - Prob. 17CPCh. 7.5 - Prob. 18CPCh. 7.8 - Prob. 19CPCh. 7.8 - Prob. 20CPCh. 7.8 - Write a set of nested loops that display the...Ch. 7.9 - Prob. 22CPCh. 7.9 - Prob. 23CPCh. 7.9 - Prob. 24CPCh. 7.9 - Prob. 25CPCh. 7.10 - Prob. 26CPCh. 7.10 - Prob. 27CPCh. 7.10 - Prob. 28CPCh. 7.10 - Prob. 29CPCh. 7.10 - Prob. 30CPCh. 7.10 - To create a bar chart with the bar function, what...Ch. 7.10 - Assume the following statement calls the bar...Ch. 7.10 - Prob. 33CPCh. 7 - This term refers to an individual item in a list....Ch. 7 - This is a number that identifies an item in a...Ch. 7 - Prob. 3MCCh. 7 - This is the last index in a list. a. 1 b. 99 c. 0...Ch. 7 - This will happen if you try to use an index that...Ch. 7 - This function returns the length of a list. a....Ch. 7 - When the operator's left operand is a list and...Ch. 7 - This list method adds an item to the end of an...Ch. 7 - This removes an item at a specific index in a...Ch. 7 - Prob. 10MCCh. 7 - If you call the index method to locate an item in...Ch. 7 - Prob. 12MCCh. 7 - This file object method returns a list containing...Ch. 7 - Which of the following statement creates a tuple?...Ch. 7 - Prob. 1TFCh. 7 - Prob. 2TFCh. 7 - Prob. 3TFCh. 7 - Prob. 4TFCh. 7 - A file object's writelines method automatically...Ch. 7 - You can use the + operator to concatenate two...Ch. 7 - Prob. 7TFCh. 7 - You can remove an element from a tuple by calling...Ch. 7 - Prob. 1SACh. 7 - Prob. 2SACh. 7 - What will the following code display? values = [2,...Ch. 7 - Prob. 4SACh. 7 - Prob. 5SACh. 7 - Prob. 6SACh. 7 - Prob. 1AWCh. 7 - Prob. 2AWCh. 7 - Prob. 3AWCh. 7 - Prob. 4AWCh. 7 - Write a function that accepts a list as an...Ch. 7 - Prob. 6AWCh. 7 - Prob. 7AWCh. 7 - Prob. 8AWCh. 7 - Total Sales Design a program that asks the user to...Ch. 7 - Prob. 2PECh. 7 - Rainfall Statistics Design a program that lets the...Ch. 7 - Prob. 4PECh. 7 - Prob. 5PECh. 7 - Larger Than n In a program, write a function that...Ch. 7 - Drivers License Exam The local driver s license...Ch. 7 - Name Search If you have downloaded the source code...Ch. 7 - Prob. 9PECh. 7 - World Series Champions If you have downloaded the...Ch. 7 - Prob. 11PECh. 7 - Prob. 12PECh. 7 - Magic 8 Ball Write a program that simulates a...Ch. 7 - Expense Pie Chart Create a text file that contains...Ch. 7 - 1994 Weekly Gas Graph In the student sample...
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- (Dynamic Programming.) Recall the problem presented in Assign- ment 3 where given a list L of n ordered integers you're tasked with removing m of them such that the distance between the closest two remaining integers is maxi- mized. See Assignment 1 for further clarification and examples. As it turns out there is no (known) greedy algorithm to solve this problem. However, there is a dynamic programming solution. Devise a dynamic programming solution which determines the maximum distance between the closest two points after removing m numbers. Note, it doesn't need to return the resulting list itself. Hint 1: Your sub-problems should be of the form S(i, j), where S(i, j) returns the maximum distance of the closest two numbers when only considering removing j of the first i numbers in L. As an example if L [3, 4, 6, 8, 9, 12, 13, 15], then S(4, 1) = 2, since the closest two values of L' = [3,4,6,8] are 6 and 8 after removing 4 (note, 8-6 = = 2). = Hint 2: For the sub-problem S(i, j),…arrow_forward(Dynamic Programming.) A group of friends is visiting a number of attractions located along a highway, starting at kilometre 0, placed at distances ɑ1 < A2 < ···arrow_forward(Greedy Algorithms) Describe an efficient algorithm that, given a set {x1, x2, . . ., xn} of points on the real line, determines the smallest set of unit-length closed intervals that contains all of the given points. Argue that your algorithm is correct.arrow_forward
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