Steady pool size

The minimum number of physical connections the pool should keep available at all times. 0 (zero) indicates that there should be no physical connections in the pool and that new connections should be created as needed. 

The default number of connections is 2.

Maximum pool size

The maximum number of physical connections the pool should contain. 0 (zero) indicates that there is no maximum. 

The default number of connections is 10.

Max Idle Timeout in Seconds

A timer thread periodically removes unused connections. This parameter defines the interval at which this thread runs. This thread removes unused connections after the specified idle time expires. It allows the user to specify the amount of time a connection can remain idle in the pool. When this is set to greater than 0, the container removes or destroys any connections that are idle for the specified duration. A value of 0 specifies that idle connections can remain in the pool indefinitely. 

The default is 300.