Modern Database Management
13th Edition
ISBN: 9780134773650
Author: Hoffer
Publisher: PEARSON
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Chapter 9, Problem 9.43PAE
Program Plan Intro
To construct:
A star type schema for the food manufacturing company.
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Consider a MAIL_ORDER database in which employees take orders for parts from customers. The data requirements are summarized as follows: o The mail order company has employees, each identified by a unique employee number, first and last name, and Zip Code. o Each customer of the company is identified by a unique customer num, first and last name, and Zip Code. o Each part is identified by a unique part number, a part name, price, and quantity. o Each order placed by a customer is taken by an employee and is given a unique order number. Each order contains specified quantities of one or more parts. Each order has a date of receipt as well as an expected ship date. The actual ship date is also recorded. Design an Entity-Relationship diagram for the above environment.
A dimensional model is used in the building of a data warehouse, but what exactly does it do?
Down below, we'll talk about the upsides and downsides of using distributed data processing.
Chapter 9 Solutions
Modern Database Management
Ch. 9 - Prob. 9.1RQCh. 9 - Prob. 9.2RQCh. 9 - Prob. 9.3RQCh. 9 - List the five major trends that necessitate data...Ch. 9 - Prob. 9.5RQCh. 9 - Prob. 9.6RQCh. 9 - Prob. 9.7RQCh. 9 - Prob. 9.8RQCh. 9 - Prob. 9.9RQCh. 9 - Prob. 9.10RQ
Ch. 9 - List four objectives of derived data.Ch. 9 - Prob. 9.12RQCh. 9 - Prob. 9.13RQCh. 9 - Explain the pros and cons of logical data marts.Ch. 9 - Prob. 9.15RQCh. 9 - What is a helper table, and why is it often used...Ch. 9 - Describe the characteristics of a surrogate key as...Ch. 9 - Prob. 9.18RQCh. 9 - What is the purpose of conformed dimensions for...Ch. 9 - Prob. 9.20RQCh. 9 - Prob. 9.21RQCh. 9 - Prob. 9.22RQCh. 9 - Prob. 9.23RQCh. 9 - Prob. 9.24RQCh. 9 - Prob. 9.25RQCh. 9 - Describe the current key trends in data...Ch. 9 - Discuss the benefits of offering data warehousing...Ch. 9 - Prob. 9.28RQCh. 9 - List six typical characteristics of reconciled...Ch. 9 - Prob. 9.30RQCh. 9 - Prob. 9.31RQCh. 9 - Prob. 9.32RQCh. 9 - Prob. 9.33RQCh. 9 - Describe some field-level and record-level data...Ch. 9 - Prob. 9.35PAECh. 9 - Prob. 9.36PAECh. 9 - Prob. 9.37PAECh. 9 - Prob. 9.38PAECh. 9 - You are to construct a star schema for Simplified...Ch. 9 - Simplified Automobile Insurance Company would like...Ch. 9 - Prob. 9.41PAECh. 9 - Prob. 9.42PAECh. 9 - Prob. 9.43PAECh. 9 - Prob. 9.45PAECh. 9 - Prob. 9.46PAECh. 9 - Prob. 9.47PAECh. 9 - Prob. 9.48PAECh. 9 - Prob. 9.49PAECh. 9 - Prob. 9.50PAECh. 9 - Prob. 9.51PAECh. 9 - Prob. 9.52PAECh. 9 - Prob. 9.53PAECh. 9 - Prob. 9.54PAE
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- Logical data modeling demonstrates how data is arranged and interconnected without considering how it will be stored or displayed. Because it is beneficial to think logically about facts. How can DFDs and these models operate together to store data, given that some or all of these systems use logical data models?arrow_forwardData integration is essential in many applications. Suppose we are given a large data relation with many tuples, with the attributes University, Address, and so on. How to discover a set of different strings that represent the same entity, such as “HU”, “Harrisburg University”, “Harrisburg University of Science and Technology” and thus should be integrated? (use python)arrow_forwardTake, for instance, a database that is used by an airline as an illustration of this point. If airlines are capable of improving their performance as a whole, then it would be appropriate for them to use a technology that cannot be serialized.arrow_forward
- When we buy a packaged data model, we get what we pay for.arrow_forwardConsider an information retrieval system that uses TF*IDF weights and a vector space model. To calculate the similarity between the query and each item, a straightforward system would have to loop over all documents in the collection. Explain briefly how an inverted index may be utilised to improve the efficiency of the IR system.arrow_forwardWhat exactly is a gradually shifting dimension?arrow_forward
- Logical data modelling demonstrates how data is arranged and how it links to other data without the need to consider how the data will be stored or represented in the future. Because it's beneficial to think about data in a logical manner while processing it. Because some or all of these systems make use of logical data models, it is important to understand how DFDs and these models interact in order to store data.arrow_forward1. PART (40%): Evaluation and optimization:A schema of the ski shop information system is given:Customer (cid, name, surname, address, telephone);Employee (eid, name, surname, address, telephone);Purchase (pid, sid, cid, eid, date);Skiis (sid, brand, model, length, hardness)Additional information is given:|Customer| =150 pages, 40 records/page|Employee| = 2 pages, 40 records/page|Purchase| = 2000 pages, 100 records/page|Skiis| = 250 pages, 30 records/pageBuffer can store up to 2500 pages.Let's assume that the following indices are now set on the schema from the previoustask:- Level 2 B+ index on the attribute Purchase.date- Hash index on the attribute Skiis.sidOur DBMS has the following algorithms to perform the join:- Hash join- Index nested loops join- Sort-merge joinTranslate the following SQL query into relational algebra and find the plan that readsthe fewest pages or blocks:SELECT Skiis.model, Skiis.lengthFROM Skiis JOIN Purchase ON (Skiis.sid = Purchase.sid)WHERE Skiis.brand =…arrow_forwardConsider a school system in which data is recorded about the movie industry. The data requirements are summarized as follows: Each subject is owned by a department and each department ismanaged by a teacher, called Head of Department (HOD). Eachdepartment has a name and a unique code number. Each subjecthas a name, unique number and credit value. All teachers have aunique ID. A HOD cannot manage more than one department at atime. Also, a HOD does not teach subjects. A subject cannot betaught by more than one teacher. Finally, the system needs toknow each student’s contact details, including, full name, studentID, address, age and gender, as well as date of enrolment in thesubject. Design an Entity-Relationship diagram for the movie databasearrow_forward
- Consider a straightforward database that contains data about a student's grades. Provide a SQL query that will return a list of the honour roll students (the top 10%), ordered by their grade point average, and design how this database may appear.arrow_forwardConstructing widely dispersed data environments requires judgments about how to effectively balance numerous elements.arrow_forwardWhen analyzing areas surrounding (or ‘near’) a location (such as a school) for demographic characteristics (such as number of persons of school age, or median household income), there are a variety of choices to define what ‘near’ should be. Two of the most common ways to do this with vector analysis are to use a ‘buffer’ (such as a 1-mile buffer) or a network ‘service area’ (such as a 4-minute drive-time). If you were asked to analyze an area surrounding (‘near to’) existing Health Clinic locations (somewhere in the US) for information on the number of households and income of those households, what is the level of geographic detail and type (or source) of data that you would likely use to obtain the demographic information? Would you choose to use a ‘buffer’ or a ‘network service area’ (or another choice) to define the area ‘near’ the Emergency Rooms? Why? After defining and creating the “near” area, what analysis operation would get the information from the demographic data layer…arrow_forward
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