02010_ch01 - Database Systems: Design, Implementation, and...

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Database Systems: Design, Implementation, and Management Eighth Edition Chapter 1 Database Systems
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th 2 Objectives The differences between data and information What a database is What the various types of databases are Why they are valuable assets for decision making The importance of database design
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th 3 Objectives (continued) How modern databases evolved from file systems About flaws in file system data management What the database system’s main components are How a database system differs from a file system The main functions of a database management system (DBMS)
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th 4 Introduction Good decisions require good information derived from raw facts Data managed most efficiently when stored in a database Databases evolved from computer file systems Understanding file system characteristics is important
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th 5 Data vs. Information Data are raw facts Information is the result of processing raw data to reveal meaning Information requires context to reveal meaning Raw data must be formatted for storage, processing, and presentation Data are the foundation of information, which is the bedrock of knowledge
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th 6 Data vs. Information (continued) Data: building blocks of information Information produced by processing data Information used to reveal meaning in data Accurate, relevant, timely information is the key to good decision making Good decision making is the key to organizational survival
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th 7 Introducing the Database and the DBMS Database: shared, integrated computer structure that stores a collection of data End-user data: raw facts of interest to the end user Metadata : data about data Metadata provides description of data characteristics and relationships in data Complements and expands value of data Database management system (DBMS) : collection of programs Manage structure and control access to data
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th 8 Role and Advantages of the DBMS DBMS is the intermediary between the user and the database Database structure stored as file collection Access database through the DBMS DBMS enables data to be shared DBMS integrates many users’ views of the data
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th 9
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th 10 Role and Advantages of the DBMS (continued) Advantages of a DBMS: Improved data sharing Improved data security Better data integration Minimized data inconsistency Improved data access Improved decision making Increased end-user productivity
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th 11 Types of Databases Databases can be classified according to: Number of users Database location(s) Expected type and extent of use Single-user database supports only one user at a time Desktop database – single-user, runs on PC Multiuser database supports multiple users at the same time Workgroup database supports a small number Enterprise database supports a large number
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th 12 Types of Databases (continued) Centralized database : data located at a single site
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This note was uploaded on 08/02/2009 for the course IST 210 taught by Professor Mcconn,charlotteryoo,jungwoo during the Summer '08 term at Pennsylvania State University, University Park.

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02010_ch01 - Database Systems: Design, Implementation, and...

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