Schema changes are the big challenges in Galera replication. So, it is recommended to understand the schema changes operation for everyone who uses the Percona XtraDB Cluster (PXB)/Galera clusters. In this blog, I am going to explain the operation and impact of the various schema changes methods used in the PXB/Galera cluster. Schema changes with [&]

https://www.percona.com/blog/2020/10/06/various-ways-to-perform-schema-upgrades-with-percona-xtradb-cluster/