Distributed Databases
Some of the columns of a relation are at different sites is which of the following?

Horizontal Partitioning
Data Replication
Horizontal and Vertical Partitioning
Vertical Partitioning

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Distributed Databases
Replication should be used when which of the following exist?

When using many nodes with different operating systems and DBMSs and database designs.
When transmission speeds and capacity in a network prohibit frequent refreshing of large tables.
The application's data can be somewhat out-of-date.
All of these

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