paul s 10 key relational database design ideas

... Java-based marks are trademarks or registered trademarks of Sun Microsystems, Inc., in the US and other countries Apress, Inc., is not affiliated with Sun Microsystems, Inc., and this book was written ... licenses are also available for most titles For more information, reference our Special Bulk Sales–eBook Licensing web page at http://www.apress.com/info/bulksales The information in this book is ... Attributes and Domains 98 Identifying Business Rules and Processes 108 Identifying Business Rules 109 ...

Ngày tải lên: 29/10/2013, 15:15

... in a database designed by someone who didn’t understand the fundamentals of database design? The first four chapters of this book are devoted to the distinct phases of relational database design ... editions of a book on database design Louis s primary areas of interest are database architecture and coding in T-SQL, and he has experience designing many databases and writing thousands of stored ... successful database designer Structure of This Book This book is composed of the following chapters: Chapter 1: Introduction to Database Concepts: This chapter provides a basic overview of essential...

Ngày tải lên: 29/10/2013, 15:15

... in your database as far as is possible It consists of a standard set of views used to view the system metadata and should exist on all database servers of any brand • In the SQL Server–specific ... naming issue causes more problems for new SQL programmers than any other Physical File In many database systems (such as Microsoft FoxPro), each operating system file represents a table (sometimes ... different files, or even different servers, but as long as the published logical names not change, users will still access the data as columns in rows in tables in a database s Note Our discussion of...

Ngày tải lên: 08/11/2013, 21:15

... Surrogate Keys Surrogate keys (sometimes described as artificial keys) are kind of the opposite of natural keys The word surrogate means “something that substitutes for,” and in this case, a surrogate ... whatchamajiggers, and he needs to replace it The essential thing for us during the logical design phase is to find all the bits of information that make up the smart keys because each of these values is likely ... key is never shared with any users It will be a value generated on the computer system that is hidden from use, while the user directly accesses only the natural keys’ values Probably the best...

Ngày tải lên: 08/11/2013, 21:15

... objects in your database as far as possible It consists of a standard set of views used to view the system metadata and should exist on all database servers of any brand • In the SQL Server–specific ... Database and schema • Tables, rows, and columns • Missing values (nulls) • Uniqueness constraints (keys) As a person reading this book, this is probably not your first time working with a database, ... blunders If a journey of a million miles starts with a single step, the first step in the process of designing quality databases is understanding why databases are designed the way they are, and this...

Ngày tải lên: 12/02/2014, 12:20

... screens for a legacy database, paper and pencil designs of new screens, and mockups in database systems with easy form design tools such as Filemaker and MS Access are of use in interface design ... queries In DBMS systems like MS Access and Filemaker there are handy graphical tools for creating and editing table structures SQL server databases such as MySQL, Postgresql, and MS SQLServer ... database In MySQL, user access rights are stored in the MySQL database, and a filesystem backup of one database on a mysql server will not include user rights MS SQL Server likewise suggests creating...

Ngày tải lên: 23/03/2014, 16:20

... fields Mflag and Pflag Mapping EER Model Constructs to Relations (cont)  Mapping of Shared Subclasses (Multiple Inheritance) A shared subclass, such as STUDENT_ASSISTANT, is a subclass of several ... classes, indicating multiple inheritance These classes must all have the same key attribute; otherwise, the shared subclass would be modeled as a category We can apply any of the options discussed ... discussed in Step to a shared subclass, subject to the restriction discussed in Step of the mapping algorithm Below both 8C and 8D are used for the shared class STUDENT_ASSISTANT FIGURE 4.7 A specialization...

Ngày tải lên: 12/05/2014, 11:55

... relations in a relational database are satisfactory DESIGNING A SET OF RELATIONS (2) Goals::  Lossless join property (a must) – algorithm 11.1 tests for general losslessness  Dependency preservation ... Normal Form Inclusion Dependencies Other Dependencies and Normal Forms DESIGNING A SET OF RELATIONS (1) The Approach of Relational Synthesis (Bottom Up design) :  Assumes that all possible functional ... Examples: - SSN -> DMGRSSN is a transitive FD since SSN -> DNUMBER and DNUMBER -> DMGRSSN hold - SSN -> ENAME is non-transitive since there is no set of attributes X where SSN -> X and X -> ENAME...

Ngày tải lên: 12/05/2014, 11:55

... relations in a relational database are satisfactory (see Algorithms 11.2 and 11.4) DESIGNING A SET OF RELATIONS (2) Goals:  Lossless join property (a must) – algorithm 11.1 tests for general losslessness ... include tuples for which DNUM has null values) Algorithms for Relational Database Schema Design (7) Discussion of Normalization Algorithms: Problems:    The database designer must first specify ... lossless join property A set of relations in 3NF Testing for nonadditive join decomposition See a simpler test in Section 11.1.4 for binary decompositions No guarantee of satisfying lossless...

Ngày tải lên: 12/05/2014, 11:55

... Microsoft Access – Module An Overview of MS-Access PA Harris, Vanderbilt University What is Microsoft Access? Microsoft Access is a relational database management system (DBMS or RDBMS) At the ... data collection and especially data analysis It is easy to export data from MS Access to Excel  SPSS PA Harris, Vanderbilt University Why choose MS-Access over other DBMS systems? Cheap, readily ... ♦ SQL is not proprietary – almost every DBMS supports SQL (including MS-Access) ♦ SQL is relatively easy to learn, but extremely powerful – one of the easiest ways to learn is to use MS-Access...

Ngày tải lên: 24/10/2014, 15:10

... Q1(CT),Q2(HRC),Q3(THR),Q4(CSG),Q5(HSR)­ +Key of­Q­is­HS Xi Source ∪ Xi (Source ∪ Xi)+ Super key Key ∅ C HS CTHRSG HS HS HSC CTHRSG HSC T HST CTHRSG HST CT HSCT CTHRSG HSCT R HSR CTHRSG HSR CR HSCR CTHRSG HSCR TR HSTR ... dependencypreserving? Answer: Step1: List all subsets of Q1+ ∅, S, Z, SZ Step 2: Find closure of all subsets of Q1+ ∅+­=∅ S+ =S Z+=ZC SZ+=CSZ Step 3: Find F1+= π Q1(F) ∅ Step 4: List all subsets of Q2+ ... Question Is D4 a Lossless decomposition? Algorithms for Relational Database Schema Design (1) Algorithm 11.2: Relational Synthesis into 3NF with Dependency Preservation (Relational Synthesis Algorithm)...

Ngày tải lên: 04/12/2015, 00:22

... two sales areas: the Front Range and the Western Slope sales areas Each sales area has a unique sales-area code Each salesperson is responsible for one or more sales areas, and has a specific sales ... territories within his districts Employees’ responsibilities not overlap A sales area is always the responsibility of a single salesperson, and managers and directors’ responsibilities not overlap Sometimes ... specific sales quota Each sales manager is responsible for one or more sales districts and sales directors who are responsible for one or more sales regions Each sales manager is responsible for...

Ngày tải lên: 25/11/2016, 19:12

... the Business Background Copyright © 2 010, Oracle and/or its affiliates All rights reserved Overview This first introductory unit comprises two lessons These lessons set the stage for the rest of ... Distinguishing Attributes and Entities 10- 6 Attribute Optionality 10- 8 Naming Standards 10- 9 Defining Naming Standards 10- 11 Using a Glossary 10- 13 Creating a Glossary 10- 14 Applying the Glossary ... personalized eKit Oracle University and Bridge Human Skills Developments,GCC use only Components of a Business Direction Statement 2-4 Business Objectives 2-5 Assumptions 2-6 Critical Success...

Ngày tải lên: 25/11/2016, 19:12

... personalized eKit Oracle University and Bridge Human Skills Developments,GCC use only Components of a Business Direction Statement 2-4 Business Objectives 2-5 Assumptions 2-6 Critical Success ... Distinguishing Attributes and Entities 10- 6 Attribute Optionality 10- 8 Naming Standards 10- 9 Defining Naming Standards 10- 11 Using a Glossary 10- 13 Creating a Glossary 10- 14 Applying the Glossary ... Quiz 5-8 Types of Processes 5 -10 Primitive Process 5-11 Composite Process 5-12 Transformation Task Process 5-14 Process Decomposition 5-17 Decomposition Guidelines 5-18 Quiz 5-19 Summary 5-20...

Ngày tải lên: 25/11/2016, 19:12

... parameters, privileges, datatypes, RMAN keywords, SQL keywords, SQL*Plus or utility commands, packages and methods, as well as system-supplied column names, database objects and structures, usernames, ... and database names, net service names, and connect identifiers, as well as user-supplied database objects and structures, column names, packages and classes, usernames and roles, program units, ... inheritance This chapter contains these topics: s SQL Object Types and References s Object Methods s Inheritance in SQL Object Types s Functions and Operators Useful with Objects Basic Components of Oracle...

Ngày tải lên: 24/01/2014, 08:20

... determine the set of access paths The access paths must be created by authorized users such as database administrators (DBAs) Access-path selection is not trivial, since an index designer must balance ... different statements.) The designer ACM Transactions on Database Systems, Vol 13, No 1, March 1988 Physical Database Design for Relational Databases 99 indicates which tables should be designed ... previous section ACM Transactions on Database Systems, Vol 13, No 1, March 1988 Physical Database Design for Relational Databases - 109 plausible for at least one statement (Sequential scan must...

Ngày tải lên: 20/02/2014, 05:21

... &Timestamp=2011-12-12T06%3A27%3A42.551Z &AWSAccessKeyId= &Signature= Sample Response 3306 ... &Timestamp=2011-05-23T06%3A27%3A42.551Z &AWSAccessKeyId= &Signature= Sample Response ... &SignatureMethod=HmacSHA256 &Timestamp=2011-02-15T17%3A10%3A50.274Z &AWSAccessKeyId= &Signature= Sample Response ...

Ngày tải lên: 07/03/2014, 23:20

... selected, such as west2-sqlsvr-1 Master User Name Type a name that you will use as the master username to log on to your DB Instance with all database privileges Master User Password Do this: ... Authorize Access: Create a DB Security Group Your first task is to set up a DB Security Group that controls what IP addresses or EC2 instances have access to your DB Instance You will use this security ... RDS begins terminating the instance As soon as the DB Instance status changes to deleted, you stop incurring charges for that DB Instance API Version 2013-01 -10 24 Amazon Relational Database Service...

Ngày tải lên: 17/03/2014, 00:20

... IOPS instances, you can restore snapshots to identically configured Provisioned IOPS instances or to standard instances If you are using standard instances, you can only restore snapshots to standard ... Process Stop all activity to your MyISAM tables (that is, close all sessions) Lock and flush each of your MyISAM tables Issue a CreateDBSnapshot API call, or use the RDSCLI rds-create-db-snapshot ... "ec2:DescribeSecurityGroups", "cloudwatch:GetMetricStatistics", "cloudwatch:DescribeAlarms", "sns:ListTopics", "sns:ListSubscriptions" API Version 2013-01 -10 27 Amazon Relational Database Service User Guide...

Ngày tải lên: 17/03/2014, 00:20

... Definitions Database Design Build Function Design Database Build Application Cross-Checking Table Definitions Index, View, Cluster, and Space Definitions Operational Database Design Module Designs Application ... Croswell, 1991 Relational Database Management System - a database system made up of files with data elements in two-dimensional array (rows and columns) This database management system has the ... system Should encapsulate and enforce business rules Should validate all changes to the database • User signs new or updated features back into the database • Does the database support this? •...

Ngày tải lên: 17/03/2014, 00:20