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Distributed Databases

Distributed Databases
Data replication is favored where most process requests are read-only and where the data are relatively static.

True
False

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Distributed Databases
A transaction manager is which of the following?

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

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Distributed Databases
In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.

False
True

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Distributed Databases
A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.

False
True

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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.

True
False

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

Horizontal and Vertical Partitioning
Vertical Partitioning
Horizontal Partitioning
Data Replication

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