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Replication Methods
Replication in database systems is a strategy for ensuring data availability, redundancy, and load balancing. There are several replication methods, each with its advantages and challenges.
1. Single-leader replication
In single-leader (a.k.a. primary-backup) replication, one node handles all writes while one or more followers asynchronously or synchronously replicate its state. The follower may or may not serve read traffic (depending upon the settings).
Example
MySQL primary-replica: one master accepts writes; replicas pull binlog events and replay them.
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