= MariaDbGaleraCluster/SchemaChange =
 * Goal: [[https://severalnines.com/blog/webinar-replay-slides-galera-cluster-best-practices-zero-downtime-schema-changes|Zero Downtime Schema Changes in Galera Cluster]]
   * two methods (TOI and RSU)
      1. Total Order Isolation (TOI)
      2. Rolling Schema Upgrade (RSU)

 * https://severalnines.com/blog/online-schema-upgrade-mysql-galera-cluster-using-toi-method
 * https://severalnines.com/blog/online-schema-upgrade-mysql-galera-cluster-using-rsu-method