PostgreSQL database connection pool exhaustion and optimization

Overview

This incident type refers to the situation where a PostgreSQL application experiences database connection pool exhaustion, leading to errors. This can happen when the number of database connections requested exceeds the maximum number of connections allowed in the pool. To prevent this issue, it is important to optimize database connections by properly configuring the connection pool settings and monitoring the usage of connections. This can help ensure that the application has sufficient resources to handle database requests without experiencing pool exhaustion.

Parameters

Debug

Check the current size of the PostgreSQL connection pool

Identify the maximum number of PostgreSQL connections allowed in the connection pool

Check the current number of open file descriptors on the system

Identify the number of connections allowed per client IP address

Check the current number of idle connections in the PostgreSQL pool

Check the current number of active connections in the PostgreSQL pool

The maximum number of connections allowed in the pool is set too low, leading to contention for available connections and eventual pool exhaustion.

Repair

Increase the maximum number of connections allowed in the connection pool. This can be done by editing the configuration file of the application and adjusting the connection pool settings.