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

The application's data can be somewhat out-of-date.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

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Distributed Databases
A distributed database is which of the following?

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

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Distributed Databases
Which of the following is a disadvantage of replication?

Each site must have the same storage capacity.
If the database fails at one site, a copy can be located at another site.
Reduced network traffic
Each transaction may proceed without coordination across the network.

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

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

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