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Distributed Databases

Distributed Databases
Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.

False
True

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Distributed Databases
A transaction manager is which of the following?

Maintains appropriate concurrency control
Maintains before and after database images
Maintains a log of transactions
All of these

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Distributed Databases
With asynchronous technology, if any copy of a data item is updated anywhere on the network, the same update is immediately applied to all other copies or it is aborted.

False
True

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Distributed Databases
Which of the following is not one of the stages in the evolution of distributed DBMS?

Remote unit of work
Distributed request
Unit of work
Distributed unit of Work

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Distributed Databases
With failure transparency, all of the actions of a transaction are committed or none of them are committed.

True
False

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Distributed Databases
A distributed database can use which of the following strategies?

Partially or totally replicated across sites
Partitioned into segments at different sites
Totally centralized at one location and accessed by many sites
All of these

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