Cursor
database
Database Connection Pool Exhausted After Refactoring
After Cursor reorganized your database connection code, the application runs out of available connections under load. Requests start failing with timeout or pool exhaustion errors.
Connections are not being properly closed or released back to the pool, causing a leak.
Error Messages You Might See
Error: connect timeout
Error: pool exhausted
No connections available in pool
ECONNREFUSED: maximum call stack exceeded
Common Causes
- Connections opened but not closed after use (missing pool.release())
- Error handling removed, preventing cleanup in catch blocks
- Pool size configuration reduced to 0 or very low during refactoring
- Long-running transactions holding connections beyond necessity
- Connection timeout increased, connections staying open longer
How to Fix It
Always close/release connections: try { const conn = await pool.acquire(); ... } finally { pool.release(conn); }. Use connection pooling config: {min: 5, max: 20}. Reduce transaction duration. Monitor pool stats with pool.status().
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Get HelpFrequently Asked Questions
How do I monitor connection pool?
Log pool.totalCount, pool.idleCount, pool.waitingCount. Or use DB monitoring tools.
What's a good pool size?
min: 5, max: 20 for most apps. Scale based on concurrent users and query duration.