Tài liệu Instructor Notes Module 9: Data Storage Considerations doc

Instructor Notes Module 9: Data Storage Considerations Introduction This module discusses data storage considerations and examines several data storage technologies.. Identify differen

Instructor Notes Module 9: Data

Storage Considerations

Introduction

This module discusses data storage considerations and examines several data storage technologies

After completing this module, students will be able to:

! Identify different types of hardware and software for implementing a data store

! Choose the appropriate hardware or software for implementing a data store

Materials and Preparation

This section provides you with the materials and preparation needed to teach this module

Materials

To teach this module, you will need the following materials:

! Microsoft® PowerPoint® file P09_1609a.ppt

! Module 9, “Data Storage Considerations”

! Activity 9.1, “Data Quiz”

Preparation

To prepare for this module, you should:

! Read all materials for this module

! Complete the activity

Presentation:

70 Minutes

Activity:

20 Minutes

2 Instructor Notes Module 9: Data Storage Considerations

Activities

Activity 9.1: Data Quiz

In this activity, students will divide into two groups and compete against each other by answering questions Use the list of questions below to test students’ knowledge of the course material Expand on students’ answers as a way of reviewing the material

After completing this activity, students will be able to:

! Identify the data characteristics and technologies appropriate for use in data-centric solutions

! To prepare for the activity

1 Review the following questions and answers Be sure you know why the given answers are correct You can provide additional questions and answers based on your own experience

a What type of database should be used for the main Ferguson and Bardell, Inc data stores? Why?

Microsoft® SQL Server™ version 7.0, because the number of employees concurrently using the application is likely to exceed 30 Additionally, many users might access the system at slower speeds than those typical

of a LAN network

Module 9

b Would Microsoft Visual FoxPro®, SQL Server, Microsoft Data Engine (MSDE), or Microsoft Jet provide the appropriate database engine for the traveling consultants that use the custom client application?

MSDE Because MSDE is code-compatible with SQL Server, you could use the same user interface for laptops, as well as desktop computers Module 9

c Will mirroring or Microsoft RAID version 5 provide the best performance for the Ferguson and Bardell, Inc database? Why?

RAID 5 Because the Ferguson and Bardell, Inc system is not primarily

a write-intensive application, the additional total storage capacity of RAID 5, along with its ability to include more than two disk drives, makes it a better choice

Module 9

d What issues should be considered before implementing a backup solution for the Ferguson and Bardell, Inc system?

Required availability, amount of data to back up, hardware from which data is being backed up, hardware used to perform the backup, and backup time window

Module 9

e What data optimization technique would guarantee that no duplicate data

is stored within the Ferguson and Bardell, Inc database?

Normalization

Instructor Notes Module 9: Data Storage Considerations 3

f Which normalization form eliminates data that is not dependent upon the primary key?

Third normal form Module 5

g What are the three components of a use case?

Actor, object, and relationship Module 3

h What are the three characteristics of data requirements?

Required, explicit, and hidden Module 3

i What normalization form eliminates repeating groups and guarantees that each column corresponds to only one value?

First normal form Module 5

j Entities in the logical model represent what in the real world?

Nouns: people, places, and objects

Module 4

k Name the type of key that links a child entity to a parent entity

Foreign key Module 5

l What type of index is created from more than one attribute or column? Composite index

Module 6

m In a physical model, what type of data relationship is generally represented with a link table?

A many-to-many relationship Module 6

n RDO accesses databases through which interface?

ODBC Module 8

o ADO accesses databases through which interface?

OLE DB Module 8

p What concept determines whether two entities depend on each other for their identities?

Existence Module 4

4 Instructor Notes Module 9: Data Storage Considerations

Module Strategy

! Choosing a Database Product This section discusses several factors students should consider when selecting a database product Although most of these factors will be familiar

to students, you might want to spend some additional time on the transactional systems slide, especially on the ACID components

! Data Storage Technologies This section provides an overview of Microsoft data storage technologies Your aim is to help students differentiate the various products, and to understand when to use which technology and why

! Data Storage Considerations This section points out a number of availability issues that students will need to consider and address when designing a data storage solution Most

of these issues should be familiar to students However, you might need to spend some additional time on RAID and clustering because some students might not have been exposed to these technologies