> what needs  to be done  to fetch the data  from data source  on wildfly 11.0.0 final unde  pool tab ?

What do you mean exactly ?

> What happens  if  we make  initial pool size = 5 ,Prefill=true , flush strategy =All connections , strict Minimum = true , use fast fail = true

initial pool size: The initial number of connections to be allocated to the pool

prefill: Should the pool be prefilled at once, instead to wait for the first connect request by the application.

flush strategy: Specifies how the pool should be flush in case of an error.

strict minimum:  If pool-use-strict-min is set to true, Wildfly will not allow the number of connections to temporarily fall below the specified minimum.

fast fail: Whether to fail a connection allocation on the first try if it is invalid (true) or keep trying until the pool is exhausted of all potential connections (false).

You can check more detailed documentation of datasource tuning.