python system_error ai_generated true

sqlalchemy.exc.TimeoutError: QueuePool limit of size 10 overflow 10 reached, connection timed out

ID: python/flask-mysql-pool-timeout

Also available as: JSON · Markdown · 中文
80%Fix Rate
86%Confidence
0Evidence
2024-04-18First Seen

Version Compatibility

VersionStatusIntroducedDeprecatedNotes
3.x active — — —

Root Cause

数据库连接池已满，因为连接未被正确释放或并发请求过多。

generic

中文

数据库连接池已满，因为连接未被正确释放或并发请求过多。

Workarounds

  1. 90% success 
    with db.session() as session: session.execute(...) 或使用 try/finally 关闭连接
  2. 80% success 
    engine = create_engine(url, pool_pre_ping=True, pool_recycle=3600)

Dead Ends

Common approaches that don't work:

  1. 50% fail

    只是暂时缓解，如果连接泄漏，仍会超时。

  2. 90% fail

    用户会看到 500 错误，且连接池仍可能阻塞。