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MIS 327 Database Management system 1 MIS 327: DBMS Dr. Monther Tarawneh Dr. Monther Tarawneh Week 2: Basic Concepts
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Database Management System A software that defines how a database store the data, support query languages, produce reports and create data entry screen. DBMS Database Application #1 Application #2 user1
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3© Prentice Hall, 2002 Definitions Data: Meaningful facts, text, graphics, images, sound, video segments Database: An organized collection of logically related data Information: Data processed to be useful in decision making Metadata: Data that describes data
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Project Life Cycle Feasibility Design Analysis Development Implementation Identify Scope, cost and schedule Gather Information & study the current system Important step in database : Define tables, relationships, forms and reports Create forms, report, help and tests Install, transfer data, train and review
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5© Prentice Hall, 2002 Advantages of Database Approach Program-Data Independence – data stored in DBMS, so applications don’t need to worry about formats – Data queries/updates managed by DBMS so programs don’t need to process data access routines – Results in: increased application development and maintenance productivity – Separate the data from the program. – Easy transfer of the data to any machine – Data stored in a centralized computer (server) or distributed and user can access that.
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6© Prentice Hall, 2002 Advantages of Database Approach Minimal Data Redundancy – Leads to increased data integrity /consistency similar Improved Data Sharing – Different users get different views of the data Enforcement of Standards – All data access is done in the same way Improved Data Quality – Constraints / obliged, data validation rules Better Data Accessibility/confidence – Use of standard data query language (SQL) Security, Backup/Recovery, Concurrency – Recovery is easier Easy application development
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Component of Database System.
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Main thing? The propose of data base is to help people track things.
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The characteristics of DB Data stored in tables. Row in the table represent record. Column represent a field.
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DB has Multiple tables. Each table contains data about one thing.
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Relationships
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Keys Primary Key: used to create relationships between tables. And help to find a record. Foreign key: provide link between two tables.
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Relationship through keys!
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Component of Database System.
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Questions
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Practice Questions thrown in the lecture and solved by students
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