communication is not assumed to be reliable. However, the delivered messages are correct, not
replicated, and received in the same order in which they are sent. All database access requests are
made through an application program at each local site of the R* system. All inter-site communica-
tions are between R* systems at different sites, thus, remote application programs are not required
in R* distributed database environment.
Any transaction generated at a particular site is initiated and controlled by the transaction
manager at that site (known as transaction coordinator). The transaction manager at that ...
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