![]() Connections in the pool are routed to a smaller number of actual PostgreSQL connections. When an application needs to connect to a database, PgBouncer provides a connection from the pool. PgBouncer is an open-source connection pooler for PostgreSQL. To overcome this limitation, Neon supports connection pooling using PgBouncer, which allows Neon to support up to 10,000 concurrent connections. With regular PostgreSQL, new connections are rejected when reaching the max_connections limit. This behavior can often be attributed to database driver limitations, running many instances of an application, or applications with serverless functions. Some applications open numerous connections, with most eventually becoming inactive. All Neon plans, including the Free Tier, support connection pooling. To increase the number of connections that Neon supports, you can use connection pooling. You can check the max_connections limit for your compute by running the following query from the Neon SQL Editor or a client connected to Neon:Įven with the largest compute size, the max_connections limit may not be sufficient for some applications. For example, a compute with 12 GB of RAM supports 1351 connections. ![]() Larger computes offered with the Neon Pro plan have more RAM and therefore support a larger number of connections. For a Free Tier compute, which has 1 GB of RAM, this works out to approximately 100 connections. The formula used to calculate max_connections is RAM in bytes / 9531392 bytes. In Neon, the size of your compute determines the max_connections setting. The PostgreSQL connection limit is defined by the max_connections parameter. PostgreSQL limits the number of open connections for this reason. Default connection limitsĮach PostgreSQL connection creates a new process in the operating system, which consumes resources. This topic describes Neon's default connection limits, how connection pooling works, and how you can enable connection pooling for your applications. ![]() Neon supports connection pooling using PgBouncer, enabling up to 10,000 concurrent connections.
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