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4d Distributed Databases
Descrição
A level, A2 IT (Chapter 4) Mapa Mental sobre 4d Distributed Databases, criado por Gladys Mba em 27-04-2017.
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it
ict
alevel
a2
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chapter 4
it
chapter 4
a level, a2
Mapa Mental por
Gladys Mba
, atualizado more than 1 year ago
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Criado por
Gladys Mba
mais de 7 anos atrás
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Resumo de Recurso
4d Distributed Databases
Partitioned Database
Horizontal Partitioning
Data is separated based on records. e.g. all records with one specific attribute are stored in one place
Each site can search from it's own records locally but have to use global search to find other records
Vertical Partitioning
Data is separated based on fields. e.g. ID and one certain field is stored in one place.
Different parts of the data stored at different sites
"Sites" can be a server or computer at a particular location
Replicated Databases
Entire database is copied for each site
Central databases with Remote Local Indexes
One central database is stored in one location.
Indexes mean that when the record is searched for locally a request for the record is sent to the central data base
Indexes have the primary key used to identify records locally and a foreign key, which is the primary key in the central database
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