UNDERSTANDING REPLICA SET TOPOLOGIES
Another concept introduced with replicated databases is the replica set topology. This refers to the distribution of replicas and the connections between them, and may be thought of as analogous to the topology of PCs on a LAN. The selection of an appropriate replica set topology is vital for the robust and efficient management of the synchronizations between replicas.
The singly connected list and star and hub topologies are analyzed in the following sections. Using replicas with local or anonymous visibility will enforce a star/hub topology because those replica visibilities can synchronize only with the parent (global) replica.
Singly Connected List
A very simple topology consisting of four replicas (Redmond, ...
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