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CockroachDB Serverless achieves sub-second cold starts through logical disaggregation, splitting its architecture into lightweight stateless SQL nodes and a shared multi-tenant KV storage layer. By placing heavy state (caching, transaction coordination, Raft replication) in the KV layer and keeping SQL nodes stateless, the system can assign pre-warmed processes to tenants in under 650ms. The design uses LSM trees with tenant ID key prefixes for multi-tenancy, implements sophisticated admission control with priority queues and token buckets to manage noisy neighbors, and trades some performance overhead (especially for OLAP workloads) for operational agility and cost efficiency for small customers.

CockroachDB Serverless: Sub-second Scaling from Zero with Multi-region Cluster Virtualization