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Distributed Databases

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
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
The semijoin approach saves network traffic.

False
True

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Distributed Databases
A transaction manager is which of the following?

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

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Distributed Databases
Storing a separate copy of the database at multiple locations is which of the following?

Vertical Partitioning
Horizontal and Vertical Partitioning
Data Replication
Horizontal Partitioning

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Distributed Databases
Synchronization for pull replication is less disruptive and occurs only when needed by each site, not when a central master site thinks it is best to update.

False
True

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