Databases that are stored on computers at multiple locations and are not interconnected by a network are known as distributed databases.
Answer: Option B
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.
Answer: Option A
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.
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.
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