chapter09 - Concepts of Database Management Fifth Edition...

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Concepts of Database  Concepts of Database  Management, Fifth Edition Management, Fifth Edition Chapter 9: Chapter 9: Database Management  Database Management  Approaches Approaches    
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2 9 Objectives Describe distributed DBMSs Discuss client/server systems Define data warehouses and explain their structure and access Discuss the general concepts of object- oriented DBMSs
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3 9 Objectives Summarize the impact of Web access to databases Provide a brief history of database management Describe the network and hierarchical data models
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4 9 Distributed Databases Computers at various sites Connected with communications network Distributed database is single logical database physically divided among networked computers DDBMS supports and manipulates distributed databases
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5 9 Figure 9.1: Communications Network
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6 9 Characteristics of Distributed DBMSs Homogeneous Same local DBMS at each site Heterogeneous At least two sites with different DBMSs
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7 9 Characteristics of Distributed DBMSs (con’t.) Location transparency User feels as though entire database is at their site Replication transparency User unaware of behind the scenes replication of the data Fragmentation transparency Logical object divided among various locations
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8 9 Unfragmented Parts Table
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9 9 Fragmented Parts Table
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10 9 Advantages of Distributed Databases Local control of data Possible legal reasons for local control over data used in a particular geographic region Increased database capability Added system availability Though parts of a database may not be accessible, transactions can still occur, increasing overall availability of the database Added efficiency Smaller tables are faster to query
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11 9 Disadvantages of Distributed Databases
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