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.
The application's data can be somewhat out-of-date.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.

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Distributed Databases
Which of the following is true concerning a global transaction?

The required data are at one local site and the distributed DBMS routes requests as necessary.
The required data are located in at least one nonlocal site and the distributed DBMS routes requests as necessary.
The required data are at one local site and the distributed DBMS passes the request to only the local DBMS.
The required data are located in at least one nonlocal site and the distributed DBMS passes the request to only the local DBMS.

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

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

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