TiDB

TiDB is an open-source, cloud-native, distributed SQL database for workloads that need strong consistency, high availability, and scale. It supports ACID distributed transactions, MySQL 8.0 compatibility, and deployment across public clouds, on-premises environments, Kubernetes, or TiDB Cloud.

TiDB separates compute from storage so nodes and resources can be adjusted independently. It uses a two-phase commit protocol for transactions and Raft consensus with multiple replicas for automated failover. HTAP uses TiKV row storage and TiFlash columnar storage, with real-time replication between them, and TiDB Server coordinates query execution across both.

TiDB is developed by PingCAP and released under the Apache 2.0 license, with all source code including enterprise-grade features available. Self-managed deployment is available through local clusters, Kubernetes with TiDB Operator, and on-premises setups, while TiDB Cloud provides a fully managed service.