Data Integration
Goal of Data Integration - provide uniform access to heterogeneous data sources in some domain.
Main approaches
- data from all data sources are federated into one main warehouse (using ETLs)
- the queries are issued to this federated storage
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- data remains in the data sources
- sometimes called "virtual data integration"
- better for the Web - there are many DBs, and we would like to find something, no matter what DB provides it
- also better if you want to access "fresh" data
- but way harder to implement - need to transform data during the query time
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See Also
Links
Source