Description of the illustration strep066.eps
This illustration shows three Oracle databases named mult1.example.com, mult2.example.com, and mult3.example.com. Each database has basically the same configuration:
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One queue that is used by the capture process, propagations, and apply processes.
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A capture process that captures changes in the redo log and converts relevant changes into LCRs, which it enqueues.
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One apply process that applies changes from each of the other two databases. For example,
mult1.example.comhas one apply process that applies changes frommult2.example.comand another apply process that applies changes frommult3.example.com. Both of these apply processes dequeue changes from the same queue. -
Each database uses two propagations to propagate locally captured LCRs to the other databases. For example,
mult1.example.comhas one propagation to propagate locally captured LCRs tomult2.example.comand another propagation to propagate locally captured LCRs tomult3.example.com.