Distributed Databases
An autonomous homogenous environment is which of the following?

A different DBMS is at each node and each DBMS works independently.
The same DBMS is at each node and each DBMS works independently.
A different DBMS is at each node and a central DBMS coordinates database access.
The same DBMS is at each node and a central DBMS coordinates database access.

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

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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.
Reduced network traffic
Each transaction may proceed without coordination across the network.
Each site must have the same storage capacity.

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

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