This is worth a read and re-read: -
This WebSphere Support Technical Exchange is designed to describe how Service Integration Bus Messaging Engines connect to data stores and how to recover from unexpected disconnections from data stores.
It's especially relevant to me right now as I work out how to get a WAS 8.5.5 Messaging Engine to happily accept the failover of its SIB database tables from one DB2 HADR box to another.
I'm currently buried in TCP/IP retry parameters ... which is nice.
Sings "I feel a blog post arisin' !"