Chapter 5 Databases
Transcript of Chapter 5 Databases
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Databases
Nanda Ganesan, Ph.D.
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Objective
Q1: What is the purpose of a database?Q2: What is a database?Q3: What is a database management system (DBMS)?Q4: How do database applications make
databases more useful?Q5: What is a NoSQL DBMS?
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Q3: What Is a Database Management System (DBMS)?
• Program used to create, process, and administer a database
• Licensed from vendors such as IBM, Microsoft, Oracle, and others
• DB2 from IBM, Access and SQL Server from Microsoft, Oracle Database from Oracle Corporation
• MySQL - open source, license-free for most applications Copyright © 2015 Pearson Education, Inc.
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Database Definition
• Database Management System (DBMS)– Access, Oracle etc.
• Database Application Systems– Student enrollment management system,
enrollment management system
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Data and Information
• Data– Unprocessed
• Information – Processed
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Q1: What Is the Purpose of a Database?
• Organize and keep track of things• Keep track of multiple themes• General rule: Single theme - store in a spreadsheetMultiple themes - use a database
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A List of Student Grades Presented in a Spreadsheet – Single Theme
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Student Data Shown in a Form, from a Database
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Data Processing
• Data Integrity– Database is as valid as the correctness of
the information stored and processed – GIGO
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Good Information Characteristics
• Accurate• Verifiable• Timely• Organized• Accessible• Useful• Cost-effective
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Data Hierarchy
Database Server
Database Application 1
File 1.1
Record 1
Field1 (Primary)
Field 2
Record 2
File 1.2
Database Application 2 File 2.1
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Q2: What Is a Database?
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Hierarchy of Data Elements
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Components of a Database
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Example of Relationships Among Rows
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Sample Metadata (in Access)
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Database Components
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File Characteristics
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Data Types
Text Numeric AutoNumber Currency
Date Memo Hyperlink
Object Attachment
Yes/No
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Data Dictionary
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Maintaining Data
• Add• Modify• Delete• Validate
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Data Validation
Alphabetic/Numeric Check Range check Consistency check
Completeness check Check digit
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Evolution of Database Management Systems
• File processing system• Hierarchical database systems• Relational database systems• Object oriented database systems
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File Processing and Database System
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Advantages of Database Systems
• Reduced data redundancy• Improved data integrity• Efficiently shared data• Relatively simple development
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Examples of Database Management Systems
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Q4: How Do Database Applications Make Databases More Useful?
• Database application– Collection of forms, reports, queries and
application programs serves as intermediary between users and database data.
• Application programs– Provide security, maintain data
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Specific Purposes of Four Elements of a Database Application
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Traditional Forms, Queries, Reports, and Applications
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Browser Forms, Reports, Queries, and Applications
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Browser Report for SharePoint Site
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Access Database Components
• Tables• Queries• Forms• Reports• Macros• Modules• Visual Programming (Visual Basic)
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Relational Database
• The entity-relationship model• Entities (objects)
– Students, classes etc.• Relationships
– Enrollment (Student to Classes)
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Types of Relationships
• One-to-one• One-to-Many• Many-to-Many• A design example
– Creating tables to capture a database
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Querying the Tables and the Database
• Query by Example• Query Language
– SQL is the most popular query language
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Processing the Database• Structured Query Language - SQL (see-quell)
– International standard – Used by most popular DBMS
INSERT INTO Student([Student Number], [Student Name], HW1, HW2, MidTerm)VALUES (1000, ‘Franklin, Benjamin’, 90, 95, 100);
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Sample SQL Statement
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Administering the Database
• Used to set up a security system involving user accounts, passwords, permissions, and limits for processing.
• Permissions can be limited in very specific ways.
• Backing up database data, adding structures to improve performance of database applications, removing unwanted data.
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Other Database Models
• Object oriented database model– Contains code and data
• Multidimensional database– In comparison, relational database is a
two-dimensional database • Web database
– Back end database to a front-end web server
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Database Personnel
• Database analyst• Database administrators• Database users
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Experiencing MIS InClass Exercise 5: How Much Is a Database Worth?
• Data has resale value.• Data on everything customers do. • Use to target customer for offerings they care about, avoid those they don’t.
• Costly and difficult to replace data collected over many years.
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Other Database Terms
• Data warehouse• Data mining
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Big Data
• The processing of large amount of data– FaceBook– Supermarkets
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Q5: What Is a NoSQL DBMS?NOSQL DBMS (NotRelational DBMS
• Supports very high transaction rates • Relatively simple data structures• Replicated on many servers in the cloud
• Examples• Dynamo (Amazon)• Bigtable (Google)• Cassandra (Facebook)
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Will NoSQL Replace Relational DBMS Products?
•Conversion very expensive and disruptive.
•Very technical, limited to those with a deep background in computer science.
•Requires years of training to use.•Organization may choose NoSQL products for specialized applications.
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Guide: No, Thanks, I’ll Use a Spreadsheet
• Story of the failed database project• Database works but doesn’t meet the requirements of
this salesperson.• Cause of database failures usually either
incompetent database developers or underfunding.
• Causes of systems development failure--poor communication between users and systems developers, lack of clear requirements, and inability to manage requirements.
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Guide: No, Thanks, I’ll Use a Spreadsheet (cont'd)
• Databases take time to build.• Complicated to operate.• Need IS people to create and keep them running.
• Salesman doesn’t want to share data.• Spreadsheets sometimes better option, especially if data needs are simple.
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Case Study 5: Fail Away with Dynamo, Bigtable, and Cassandra
•Current relational DBMS products not designed for large, multi-server systems
•NoSQL databases – Dynamo (elastic), Bigtable (elastic), Cassandra (used by Facebook, Twitter, Digg, Reddit)
•Amazon: Dynamo•Google: Bigtable processes petabytes of data on hundreds of thousands of servers
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Case Study 5: Fail Away with Dynamo, Bigtable, and Cassandra
•Current relational DBMS products not designed for large, multi-server systems
•NoSQL databases – Dynamo (elastic), Bigtable (elastic), Cassandra (used by Facebook, Twitter, Digg, Reddit)
•Amazon: Dynamo•Google: Bigtable processes petabytes of data on hundreds of thousands of servers
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