*$_Storing a separate copy of the database at multiple locations is wh – McqOptions

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1.	*$_Storing a separate copy of the database at multiple locations is which of the following??
A.	Data Replication
B.	Horizontal Partitioning
C.	Vertical Partitioning
D.	Horizontal and Vertical Partitioning
Answer» B. Horizontal Partitioning

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The purpose of timestamping is to avoid the use of locks.~!
The problem of concurrency control is more complex in a distributed database.~!
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 distributed unit of work allows various statements within a unit of work to refer to multiple remote DBMS locations.%!
In a semijoin, only the joining attribute is sent from one site to another, and then only the required rows are returned.%!
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.%!
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.%!
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.%!
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.%!