The semijoin approach saves network traffic. – McqOptions

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1.	The semijoin approach saves network traffic.
A.	1
B.
Answer» B.

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In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.
A distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.
The purpose of timestamping is to avoid the use of locks.
The cost to perform a snapshot refresh may depend on whether the snapshot is simple or complex.
The problem of concurrency control is more complex in a distributed database.
An increasingly popular option for data distribution as well as for fault tolerance of any database is to store a separate copy of the database at each of two or more sites.
The semijoin approach saves network traffic.
Asynchronous technology can result in unsatisfactorily slow response time because the distributed DBMS is spending considerable time checking that an update is accurately and completely propagated across the network.
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.
A homogenous distributed database is which of the following?