Database applications are rapidly emerging as important candidates
for parallel solutions, especially in distributed environments.
We present a strategy for efficient transaction management in
an environment of replicated autonomous databases. Two such
protocols are developed, one for a LAN environment and one for
remote replcation involving lower communication overhead but
assuming a loose logical partition of the database schema. Our
protocol improves response time and throughtput by exploiting
parallelism at the expense of reducing the level of transaction
isolation. We are able to prove that users of the parallel replicated
system can view it as equivalent to that of a single database
providing `degree 2' transaction isolation, i.e. the replication
and parallelism is transparent to the application programmer.
Experimental results using a prototype demonstrating potential
performance improvements are also presented.
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