TDSQL for MySQL supports real-time expansion in the console. There are two capacity expansion methods: adding shards and expanding the existing shards. The entire expansion process is completely imperceptible to your business without downtime. Only a fraction of shards become read-only for seconds (or are interrupted) during the expansion, while the entire cluster will not be affected.
TDSQL for MySQL achieves automatic expansion and ensures stability with Tencent's automatic rebalancing technology.
The expansion based on existing shards is actually to replace the old one with a larger physical shard.
The expansion based on existing shards does not add any shard and will not change the logic rules of sharding or the number of shards.
A distributed database contains multiple shards. To upgrade the specification of an existing TDSQL for MySQL instance, please see Purchase and Upgrade.