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

Horizontal and Vertical Partitioning
Vertical Partitioning
Data Replication
Horizontal Partitioning

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Distributed Databases
A semijoin is which of the following?

Only the joining attributes are sent from one site to another and then all of the rows are returned.
Only the joining attributes are sent from one site to another and then only the required rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.
All of the attributes are sent from one site to another and then only the required rows are returned.

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Distributed Databases
A homogenous distributed database is which of the following?

A different DBMS is used at each location and data are distributed across all nodes.
The same DBMS is used at each location and data are not distributed across all nodes.
A different DBMS is used at each location and data are not distributed across all nodes.
The same DBMS is used at each location and data are distributed across all nodes.

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Distributed Databases
A distributed database is which of the following?

A single logical database that is limited to one location.
A loose collection of file that is spread to multiple locations and is interconnected by a network
A single logical database that is spread to multiple locations and is interconnected by a network
A loose collection of file that is limited to one location.

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