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
如果任一解决方案耗尽一种类型的所有连接，导致其他解决方案没有连接可用，问题就会产生。
Problems can occur if any single solution USES up all of the connections of one type, leaving no connections for other solutions to use.
当连接表的连接列上没有可用索引时，通常使用该连接方法。
This join method is usually used when no index is available on the join columns for the joining tables.
他不喜欢你的建议，然而他没有提出反对。and之后的yet是连接副词，不可用but代替。
He did not like your suggestion, and yet he raised no objection.
如果验证不可用，或是服务器拒绝了验证，那这个连接将会在没有授权的情况下继续。
Then, if credentials are not available, or if the server rejects the credentials, the connection continues without authenticating.
网络驱动器无法连接，因为没有可用的驱动器名。
The network drive cannot be connected because there are no free drive letters.
在当没有LAN或可用的无线网络的情况下，那么笔记本也能够连接到移动电话网络。
In cases when there are no LAN or wireless networks available, then the notebook is also able to connect to the mobile phone network.
如果没有可用的空闲的连接，将创建一个新的连接，并且把它放到连接池中。
If no usable free connection is found in the pool, new connection is created and added to the pool.
如果没有可用的空闲的连接，将创建一个新的连接，并且把它放到连接池中。
If no usable free connection is found in the pool, new connection is created and added to the pool.
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