MIS-Komponen Elektronik 2011
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Transcript of MIS-Komponen Elektronik 2011
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File Structures
Sequential File Structure
Direct File Structure
Indexed Sequential File
Structure
Accessing Records
File Structures in on-Line, Real-
Time Processing
File Structures in Batch
Processin
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File Management
Software Commercially Prepared File
Management Software
File Management ProgramsDeveloped in-House
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Searching Files
Primary Keys
Secondary Keys
Search Parameters
Wild Cards
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Database Concepts
Files vs. Databases
File Management Software vs.
Database ManagementSoftware
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Database Concepts
(Cont.) Data Independence
Data Redundancy
Data Integrity
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Database Management
Systems Stores Data in a Uniform Way
Organizes Data Into Records in
a Uniform Way
Allows Access to Data in a
Uniform Way
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Components of a
Database Management
System Data Dictionary/Directory
Data Languages
Teleprocessing Monitor
Application Development
System
Security Software
Archiving and Recovery
Systems
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DBMS Components
(cont.) Report Writers
SQL and Other Query Languages
Microcomputer and
Minicomputer Versions of
Mainframe Databases
The Database Administrator
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Views of the Database
The Conceptual View
The External View
The Internal View
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Database Structures
Hierarchical Database Structure
Network Database Structure
Relational Database Structure
Object-Oriented Databases
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Hierarchical Database
Structure Inverted Tree
Root Record
Parent Record
Children Records
Nodes
Processing Is Done One Record
at a Time
Requires Explicit Links Between
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Network Database
Structure Record Sets
Owner Records
Member Records
Processing Is Done One Record
at a Time
Less Flexibility in Ad Hoc
Queries
Requires Explicit Links Between
Records
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Relational Database
Structure Two-Dimensional Tables
Rows Are Records
Columns Are Data Elements or
Fields
Processing Can Be by Tables,
Rows, or Columns
doesn't Require Explicit Links
Between Records
Eas to Perform Ad Hoc Queries
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Object-Oriented
Database Structure Storing Documents, Images,
Drawings, Videos, and Other
Nontext Data Complex Data Types That Vary
in Type, Length, Content, and
Form Need Support for Cad,
Multimedia, and Other Systems
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Object-Oriented
Databases Objects and Attributes
Messages
Methods
Object Classes
Attribute and Behavior
Inheritance
Reusable Objects
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Advantages of Database
Management Systems Data Sharing
Reduced Data Redundancy
Improved Data Integrity
Data Independence
Increased Application
Programmer and User
Productivity
Improved Data Administration
and Control
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Distributed Databases
Centralized Databases
Distributed Data Processing
Distributed Database Systems
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Methods of Distributing
a Database Replicated
Partitioned
Functional
Geographic
Hierarchical
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On-Line Databases and
Information Utilities Market Quotations
Market Information
General News and Information
Specific News and Information
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Data Repositories
Data Repositories
Repository Managers
