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MariaDB Database Replication

Master-slave replication is used to solve a number of different problems with performance, supporting the backup of different databases, and as a part of a larger solution to alleviate system failures. It enables data from one database server (the master) to be replicated to one or more database servers (the slaves). The master logs the updates, which then ripple through to the slaves. The slave outputs a message stating that it has received the update successfully, thus allowing to send the subsequent updates. Master-slave replication can be either synchronous or asynchronous. The difference is simply the timing of propagation of changes. If the changes are made to the master and slave at the same time, it is synchronous. If changes are queued up and written later, it is asynchronous.

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