Some database operations such as joins can see a significant difference inspeed when data (e.g., one of the relations involved in a join) fits in memoryas compared to the situation where the data do not fit in memory. Showhow this fact can explain the phenomenon of superlinear speedup, where an application sees a speedup greater than the amount of resources allocated to it.

Some database operations such as joins can see a significant difference inspeed when data (e.g., one of the relations involved in a join) fits in memoryas compared to the situation where the data do not fit in memory. Showhow this fact can explain the phenomenon of superlinear speedup, where an application sees a speedup greater than the amount of resources allocated to it.

Systems Architecture

7th Edition

ISBN:9781305080195

Author:Stephen D. Burd

Publisher:Stephen D. Burd

Chapter3: Data Representation

Section: Chapter Questions

Problem 3RP

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To access a database, we need to open a connection to it first and close it once our job is done. Connecting to a database depends on the type of the target database and the database management system (DBMS). For example, connecting to a SQL Server database is different from connecting to an Oracle database. But both these connections have a few things in common: •They have a connection string •They can be opened•They can be closed•They may have a timeout attribute (so if the connection could not be opened within the timeout, an exception will be thrown).Your job is to represent these commonalities in a base class called DbConnection. This class should have two properties: ConnectionString : stringTimeout : TimeSpanA DbConnection will not be in a valid state if it doesn’t have a connection string. So you need to pass a connection string in the constructor of this class. Also, take into account the scenarios where null or an empty string is sent as the connection string. Make sure to…
As an example, think of a database for an airline that uses something called "snapshot isolation." If the overall performance of the airline can be improved, it's possible that non-serializable executions might be acceptable.
Draw an ERD for the following problem. Help design the backend database for a startup company (imagine Facebook back in the “old” times), which plans to launch a social media platform that allows USERS to share their “MOMENTS” (like a posting) with their FRIENDS. A user may have some FRIENDS who are users of the system as well. A User can send a request to another user to become a friend. A user and his/her friend can post COMMENTS and LIKES to a MOMENT. Draw an ERD and show some important attributes (e.g., key, username, password, moment posting time, etc.). Clearly state any assumptions. When possible, convert to associate entities.
ASS -3 Consider the person database with info table has been created. Develop a web application with functions such as that. The user can choose from the main interface one of the following operations • Add a new record to the information table, in case there is any problem with data entry, help the user by reducing the re-entry process and highlighting the place of the wrong • Search for a specific record by id or first name (use roadio button) • List and Count the number of the record with the same first name or middle name or both together (use check button) • Delete records based on the last name • After the selected process is completed successfully, the main interface appears again with the option to exit
This example might be enhanced by beginning with an airline database that uses "snapshot isolation." What if a non-serializable execution improved the airline's performance instead?
In Perl language Inserting data into a flat-file database and amounts to simply tacking the new data onto the end of the file For example, inserting a new megalith record into a colon-delimited file can be expressed ?|
This example might benefit from beginning with a database maintained by an airline that makes use of "snapshot isolation." What if, instead of producing a greater overall performance for the airline, a non-serializable execution did it instead?
Imagine you're working with a database for an airline that employs snapshot isolation. Explain a scenario in which a nonserializable execution takes place, but the airline decides to accept it since it will increase performance overall.
use c++ to answer the folloing two question 1. implement a city database using a BST to store the database records. Each database record contains the name of the city (a string of arbitrary length) and thecoordinates of the city expressed as integer x- and y-coordinates. The BST should be organized by city name. Your database should allow records to be inserted, deletedby name or coordinate, and searched by name or coordinate. Another operation that should be supported is to print all records within a given distance of a specifiedpoint. Use following two classes:struct city{/* add the city attributes and pointers to left and right child nodes*/}class CityDB{/* create a BST for a City Database here in this class */}Note: The distance formulais > \«: «-w »* , where x1y1 are coordinates of city 1 and x2, y2 are coordinates of city 2. 2.Create the same City Database that you created in the first question using Hash table. Add another attribute in the City record, that is, city_id. Use…
This example works well with an airline database that employs "snapshot isolation." What if a non-serializable execution improves the airline's overall performance?
FastLink Limited is a microfinance company that gives out loans to deserving customers. Customers pay simple interests on the loan given (Principal) per annum. FastLink urgently needs a system that will help them keep proper records on their customers as well as loan records. 1. Customers are charged a simple interest per annum on any approved loan. Assuming every loan applied for is approved, develop an interface that will help the company to keep records of their loan applicants in a database. Remember, only registered customers of the company can access loans.Simple Interest (SI) = (Principal (P) * Rate(R) * Time (T)) / 100.The Principal, Rate and Time should be entered. 2.Create an interface for retrieving the loan records of a client showing the basic records of theclient as well as the loan records of the client.
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