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Database Software File Management Systems Database Management Systems
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Both Groups Contain: File Manager creating file structure adding, deleting, or editing records sorting records Query Facility Report Generator
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File Management Systems Work with one file at a time Usually cheap and easy to use Inefficient for relating data in different files
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Example: Order File customer number order Customer File customer number name address
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Problems with File Management Systems data redundancy - repetition of the same data in different files data integrity - errors caused by differences in redundant data data dependence - files are dependent on hardware or software
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Database Management Systems Can combine information from more than one file Self-descriptive Expanded query facilities nonprocedural query languages procedural query languages (SQL) Data Security
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Advantages of Database Management Systems better information faster response time lower operating costs fewer storage requirements improved data integrity better data management and security
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Disadvantages of Database Management Systems DBMS software is relatively expensive often requires new hardware usually requires training to use
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Database Management on Large Computer Systems Hierarchical Network Relational Object Oriented Client Server Systems Distributed Database Systems
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Hierarchical Databases first to be developed stores data in the form of a tree sets up a one to many relationship
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Network Databases modification of the tree model relationship between data elements can be many to one or many to many
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Hierarchical and Network Data Models less data redundancy than relational model fast data access for predefined queries good security useful for transaction processing environments not very flexible - designed for speed
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Relational Database Model based on tables of data objects designed for flexibility useful for decision support slower processing times and less security than other two models
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Object Oriented Database Can store objects in a database object-relational database management systems Oracle, Access
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Client-Server Systems Client computers run a desktop DBMS with a GUI front end - Access, Paradox Server computer contains and manages the database itself back end - SQL Server, DB2 Lower hardware cost Scalability
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Distributed Database Systems database is divided among several smaller computers that are hooked up in a client-server form of a network data is stored at most needed site all clients on the network can access any part of the database
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