IT notes

galera alter

To prevent bloking the cluster while doing ALTERS (SCHEMA UPGRADES), do this per node: SET wsrep_OSU_method='RSU'; Then Run the ALTER statement once done reset the Schema Upgrade method back to Total Order Isolation. SET wsrep_OSU_method='TOI'; http://galeracluster.com/documentation-webpages/clusterstallonalter.html http://galeracluster.com/documentation-webpages/schemaupgrades.html