如果发现应用程序响应变慢，但处理器使用比较低，可能是没有足够的可用连接用于执行数据库查询。
If you notice that the application responds slowly, yet processor utilization is low, there may not be enough connections available to perform a query on the database.
这表明有大量空闲连接可用，且没有线程在等待连接，从而实现了更快的响应速度。
This shows that there were plenty of free connections available and no threads were waiting for a connection, which produces much faster response times.
warn可用于表示某些可重试的事情已失败的情形；例如，它可以警告某个连接在第一次尝试时没有成功建立，并且系统将再次尝试。
warn could be used to indicate situations where something retryable has failed; for instance, it could warn that a connection was not established the first time and that the system was trying again
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