Galera is a database clustering solution that enables you to set up multi-master clusters using synchronous replication. MySQL is an open source relational database management system that is a popular choice for SQL databases. In an active-active cluster, every node is read-write and a change made to one is replicated to all. Some active-passive clusters also allow SELECT operations on passive nodes. In active-passive clusters, all writes are done on a single active server and then copied to one or more passive servers that are poised to take over only in the event of an active server failure. In the event that one of the instances fails, others are quickly available to continue serving.Ĭlusters come in two general configurations, active-passive and active-active. IntroductionĬlustering adds high availability to your database by distributing changes to different servers. The author selected the Free and Open Source Fund to receive a donation as part of the Write for DOnations program.
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March 2023
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