Citus reviews: what Postgres teams say at scale

Citus is a PostgreSQL extension, also available as Azure Cosmos DB for PostgreSQL, that distributes tables across worker nodes using a chosen shard key and is generally viewed favorably for multi-tenant SaaS applications with tenant-scoped transactional queries. Reviews commonly praise its PostgreSQL compatibility, reduced need for application-level sharding, predictable scale-out when queries include the distribution column, and lower operational burden in the managed Azure offering. Reported drawbacks include the difficulty of changing an initial distribution key, coordinator overhead for cross-shard joins and company-wide analytics, shard rebalancing during cluster growth, and limitations affecting some extensions, constraints, and DDL patterns. The text concludes that Citus is best suited to tenant-bound OLTP workloads, while organizations needing high-volume cross-tenant analytics, dashboards, or event processing often separate analytics into columnar systems such as ClickHouse, potentially using CDC or event exports; it also presents Tinybird as a managed analytics option built around that approach.

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