Pgpool-II review
A feature-rich PostgreSQL proxy for teams running their own database clusters.
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Pgpool-II is open-source middleware placed between PostgreSQL clients and database servers. It presents a PostgreSQL-compatible interface while managing backend connections and relaying traffic, making it suited to teams operating PostgreSQL clusters that need pooling, routing and availability features without substantially changing existing database applications. Its focus is narrow but clear: PostgreSQL infrastructure rather than a general-purpose database proxy covering multiple systems.
The published project model is open source, with a free plan and self-hosted deployment. Pgpool-II combines connection pooling and reuse of established PostgreSQL backend connections with read-query load balancing across configured backends. Rules can route queries to primary, standby or selected backend nodes, while connection controls help limit excess connections. These capabilities make it useful where traffic distribution and connection management are central requirements, but they also place configuration and infrastructure responsibility on the operating team.
Availability features extend beyond basic proxying. Pgpool-II supports native and PostgreSQL streaming replication, automatically detaches unavailable database servers during failover, and provides online recovery for synchronizing and reattaching nodes. Watchdog-based high availability applies to Pgpool-II itself, while an in-memory query cache can reduce repeated database work. Teams should choose it when they need broad PostgreSQL cluster-management features in a self-hosted proxy. Organizations seeking support for other database systems or a hosted deployment should choose an alternative.
Pgpool-II pros and cons
- Where it wins
- Connection pooling, query routing and read-query load balancing
- Automatic failover, replication support and online recovery
- Watchdog HA, in-memory caching and configurable backend rules
- Where it doesn't
- Supports PostgreSQL rather than multiple database systems
- Linux and self-hosted deployment require infrastructure ownership
- Cluster configuration and ongoing operations remain with the team
Pgpool-II fact sheet, pricing and score →
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