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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.
True
Correct Answer:
True
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Distributed Databases
With failure transparency, all of the actions of a transaction are committed or none of them are committed.
Data replication is favored where most process requests are read-only and where the data are relatively static.
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.
The semijoin approach saves network traffic.
Replication may use either synchronous or asynchronous distributed database technologies, although asynchronous technologies are more typical in a replicated environment.
The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.
Each site (or node) in a distributed system is subject to the same types of failure as in a centralized system.
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