Postgres-XL is a distributed relational database management system (RDBMS) software based on PostgreSQL.

It aims to provide feature parity with PostgreSQL while distributing the workload over a cluster.

Postgres-XL is based on Postgres-XC, an earlier distributed PostgreSQL system developed by NTT Data and EnterpriseDB.

[4] In 2012, the cloud database startup StormDB[5] adopted Postgres-XC and developed some proprietary extensions and improvements to it.

It requires a fast interconnect between nodes, so Postgres-XL is not suited to geographically distributed clusters.