KM_Pres_PA_Ch9

KM_Pres_PA_Ch9 - Chapter 9 Project Q & A Advanced...

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Chapter 9 Advanced Topics
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Distributed Database A distributed database is a single logical database that is physically divided and stored on computers at several sites of a computer network and at which users can access data at any site in the network What if users couldn't access data at different sites? Called decentralized database
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Distributed DBMS or DDBMS A distributed database management system is a DBMS that is capable of supporting and manipulating distributed databases. Each site has a local DBMS. Homogeneous or heterogeneous Oracle is capable of distributed processing It can be used as a front-end to other database management systems Three important characteristics: location, replication and fragmentation transparency
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Important characteristics of DDBMS Location Transparency Means that users will not need to know where data is stored (i.e. they don't have to know which remote site has the data) Other than access delay, it will appear to users that the data resides locally
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Important characteristics of DDBMS (cont) Replication Transparency Replication is having copies of database a more than
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KM_Pres_PA_Ch9 - Chapter 9 Project Q & A Advanced...

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