DDM supports both computing layer (DDM) capacity expansion (increasing the number of nodes or upgrading node specifications) and storage layer (MySQL) online capacity expansion. Storage layer…

DDM supports both computing layer (DDM) capacity expansion (increasing the number of nodes or upgrading node specifications) and storage layer (MySQL) online capacity expansion. Storage layer capacity expansion is divided into horizontal expansion (the total number of shards remains unchanged) and doubling expansion (doubling the number of shards). Computing layer capacity expansion impacts business operations within seconds, while storage layer capacity expansion is completely transparent to business operations.