Python Programming: An Introduction to Computer Science, 3rd Ed.
3rd Edition
ISBN: 9781590282755
Author: John Zelle
Publisher: Franklin, Beedle & Associates
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Chapter 9, Problem 3D
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Top-down model:
- In python
programming , the functions can be called from main code or from any other function. - The complexity of a program code can be reduced using a technique called “top-down design”.
- In top-down design,
- The programmer concentrates on the important actions that should be done firstly.
- Here, the programmer defines all the important actions (functions) without worrying about details of how it is done.
- The functions are handled later.
- In top down design,
- The complex problem is divided to smaller sub problems.
- Then all the smaller sub problem is again applied with the dividing technique.
- So, eventually the programmer gets the smallest possible divisions which are easy to solve.
- Finally, all the solved sub-problems are added to get the solution for original complex problem.
Spiral model:
- The spiral model is introduced by the scientist Barry Boehm in 1986.
- The phases of a spiral model begin with a design goal and ends with a review progress from client...
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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
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For each of the following concurrency control mechanisms, describe how they will handle each of the sequences (S1 & S2).
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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.
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Chapter 9 Solutions
Python Programming: An Introduction to Computer Science, 3rd Ed.
Ch. 9 - Prob. 1TFCh. 9 - Prob. 2TFCh. 9 - Prob. 3TFCh. 9 - Prob. 4TFCh. 9 - Prob. 5TFCh. 9 - Prob. 6TFCh. 9 - Prob. 7TFCh. 9 - Prob. 8TFCh. 9 - Prob. 9TFCh. 9 - Prob. 10TF
Ch. 9 - Prob. 1MCCh. 9 - Prob. 2MCCh. 9 - Prob. 3MCCh. 9 - Prob. 4MCCh. 9 - Prob. 5MCCh. 9 - Prob. 6MCCh. 9 - Prob. 7MCCh. 9 - Prob. 8MCCh. 9 - Prob. 9MCCh. 9 - Prob. 10MCCh. 9 - Prob. 2DCh. 9 - Prob. 3DCh. 9 - Prob. 1PECh. 9 - Prob. 2PECh. 9 - Prob. 3PECh. 9 - Prob. 4PECh. 9 - Prob. 5PECh. 9 - Prob. 6PECh. 9 - Prob. 7PECh. 9 - Prob. 8PECh. 9 - Prob. 9PECh. 9 - Prob. 10PECh. 9 - Prob. 11PECh. 9 - Prob. 12PECh. 9 - Prob. 13PECh. 9 - Prob. 14PE
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