dm_chap01 - Chapter 1 Database Environment and Development...

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Chapter 1 Database Environment and Development Process
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Data Management It is a capital mistake to theorize before one has data Sir Arthur Conan Doyle
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What is Data Management? All the value of this company is in its people. If you burned down all our plants, and we just kept our people and our information files, we should soon be as strong as ever. Thomas Watson, Jr. Former chairman of IBM
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4 Data Management Definition Controlling, protecting and facilitating access to data in order to provide information consumers with access to data they need. -
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5 Basic Definitions Data : Known facts that can be recorded and have an implicit meaning. Database : A collection of related data. Database Management System (DBMS) : A software package/ system to facilitate the creation and maintenance of a computerized database. Database System : The DBMS software together with the data itself. Sometimes, the applications are also included.
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6 Traditional File Processing Systems Before the advent of DB Systems File systems are used to store data. File systems do not provide mechanisms for data management Programmers need to do a lot of data management tasks Defining data structures Manipulating data: inserting, searching, updating, deleting Maintaining data consistency and data integrity Handling data access permission Controlling concurrent data access
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7 Disadvantages of File-Processing Systems Program-Data Dependence Duplication of Data Limited Data Sharing Lengthy Development Times Excessive Program Maintenance
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8 File Systems vs. Database Systems File Systems Database Systems Data redundancy Data consistency Difficult data access Simple data access Integrity problem Integrity constraint Atomicity problem Ensure atomicity Concurrent access anomalies Concurrency control Security problem Authorization mechanism Long development Short development Tightly-couple data-program relationship Data independence
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9 Database Approach Data Model – graphical system used to capture data and relationships between data. Entity – a noun – person, place, thing, event, concept in the business environment Relationships – defines how entities are related to each other. Relational Databases Represents the data Collection of tables (entities that related data)
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10 Database Approach Database Management Systems (DBMS) Software system used to define and store databases Used to create, maintain, and provide controlled access to user databases.
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