What is Replication?

Replication in a database system refers to maintaining a copy of all of your data on a different server or site. Replication can be used as part of a wider solution to lessen system failures, as a support for the backup of several databases, and to handle a variety of other issues.

While some database servers, like MySQL, support replication natively, others require third-party software.

Data from one MySQL database server (the source) can be replicated to one or more MySQL database servers through replication (the replicas). Replicas do not need to be continually linked to the source in order to get updates from it because replication is by default asynchronous. You can replicate all databases, particular databases, or even specific tables inside a database, depending on the setup.


Replication in MySQL has several benefits, including:


Scale-out systems, which distribute the workload over several clones to enhance performance. In this setup, the replication source server must handle all writes and changes. However, reads may occur on one or more copies. Since the source is only used for updates, this architecture can significantly speed up reads across an increasing number of replicas while improving write performance.

Data security: Since data is duplicated to the replica and the replica has the ability to pause the replication process, backup services can be used on the replica without affecting the source data that corresponds to them.

Analytics can be used to create real-time data on the source while analyzing it on the replica without degrading the performance of the source.

Long-distance data dissemination – without having ongoing access to the source, replication can be used to make a local copy of the data that a remote location can use.


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