For those coming from the world of traditional relational database management systems or even enterprise-level Microsoft SQL Server or Oracle, MongoDB presents an innovative way of thinking about scaling and availability. This chapter introduces all the core concepts of MongoDB deployments and explains how MongoDB nodes achieve high-availability, low-latency replication, and handle unexpected infrastructure failures.
Redundancy is ambiguous because it seems like a waste if nothing unusual happens. Except that something unusual happens-usually.
—Nassim Nicholas Taleb, scholar, risk analyst, ...
