Database Connection Pool Calculator
Calculate the optimal database connection pool size from concurrent users, average query duration, and maximum connections. Reduce connection overhead and latency.
How to Use the Connection Pool Calculator
- Enter the number of concurrent users.
- Enter average query duration in milliseconds.
- Enter maximum allowed database connections.
- Click Calculate to get optimal pool size.
使用场景
- •Configuring HikariCP, pgBouncer, or similar pool managers.
- •Sizing database connections for microservices.
- •Diagnosing connection exhaustion under load.
- •Planning database capacity for traffic spikes.
公式
Pool size = min(ceil(users × query ms / 1000), max connections). Utilization = pool size / max connections × 100%.
常见问题
Why not just use maximum connections?
Too many connections waste memory and increase context switching overhead. The optimal pool is much smaller than max.
What is a good connection pool size?
A common formula: pool size = (core count × 2) + effective spindle count. For most apps, 10–20 connections is optimal.
What happens when the pool is exhausted?
New requests wait for a connection to become available. High wait probability indicates you need a larger pool.