Before changing shards, you need to carry out a preliminary evaluation and determine the number of new shards, whether to scale up the current DDM node class, and the number of required data nodes and their specifications.
- Data volume: Run show db status to query the volume of data involved.
- DDM node class: Determine nodes of the DDM instance and vCPUs and memory size of each node.
- Data node class: Determine the number of data nodes and vCPUs and memory size of each node.
- Business scale: Analyze current service scale and growth trend.