citus

Citus is an open-source distributed database for PostgreSQL. It works as an extension to PostgreSQL, transforming a single node into a scalable distributed database that can handle a much larger volume of data and transactions. Citus achieves this by sharding data across multiple PostgreSQL nodes, which are organized into a cluster. A coordinator node manages the cluster and distributes queries to the worker nodes, then aggregates the results.

The primary benefit of Citus is its ability to scale PostgreSQL horizontally. This allows applications to grow their data storage and processing capabilities without significant downtime or complex re-architecting. It supports common PostgreSQL features and tools, making it relatively easy for developers familiar with PostgreSQL to adopt. Citus is particularly well-suited for real-time analytics, high-throughput transactional systems, and multi-tenant applications where data isolation and scalability are crucial.

Citus offers various sharding strategies, including hash, range, and distributed-list sharding, allowing users to choose the best approach based on their query patterns and data distribution needs. It also provides features like distributed query execution, real-time materialized views, and PostgreSQL compatibility. The extension is designed to maintain the familiar developer experience of PostgreSQL while adding distributed capabilities.