minimum-delivery-interval-in-millis

7000

(optional) Specifies the minimum time before an expiration for a particular timer can occur. This guards against extremely small timer increments that can overload the server. 

max-redeliveries

1

(optional) Specifies the maximum number of times the EJB timer service attempts to redeliver a timer expiration due for exception or rollback. 

timer-datasource

jdbc/ __TimerPool

(optional) Overrides the cmp-resource value specified in sun-ejb-jar.xml for the timer service system application (__ejb_container_timer_app ).

redelivery-interval-internal-in-millis

5000

(optional) Specifies how long the EJB timer service waits after a failed ejbTimeout delivery before attempting a redelivery.