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What is known so far comes from the other direction:
These projects were analysed and named PolarDB-for-PostgreSQL among their alternatives. The relationship is not symmetric — how PolarDB-for-PostgreSQL rates them is a separate judgement, made when PolarDB-for-PostgreSQL is analysed in its own right.
calls PolarDB-for-PostgreSQL “Cloud-native PostgreSQL-compatible database from Alibaba, choose for PostgreSQL workloads on Alibaba Cloud with separate compute-storage scaling.”
TiDB is built for agentic workloads that grow unpredictably, with ACID guarantees and native support for transactions, analytics, and vector search. No data silos. No noisy neighbors. No infrastructure ceiling.
calls PolarDB-for-PostgreSQL “Choose when you want a cloud-native Postgres-compatible database with storage/compute separation, rather than sharding.”
Distributed PostgreSQL as an extension
calls PolarDB-for-PostgreSQL “Choose if you want a cloud-native PostgreSQL fork with compute-storage separation, especially in Alibaba Cloud ecosystem.”
YugabyteDB - the cloud native distributed SQL database for mission-critical applications.
calls PolarDB-for-PostgreSQL “Choose for PostgreSQL compatibility with cloud-native shared-storage scaling, if you don't need MySQL compatibility.”
OceanBase is the unified distributed database for the AI era — open-source, multi-model, one engine for your most demanding workloads.