Berkeley DB Family

Hi~

I am applying BDB to my embbeded system

I open some db files by using BDB functions "db_create(&dbp, NULL, 0)" and "dbp->open"
and don't close "dbp->close" until shutting down the system.

but, in case of unexpected shutting down(for example, pulling out a bettery, deaded bettery) the system can't close.
In that case, is there possbility to break db files?
If so, please tell me how to recover them
(I use "dbp->sync" when inserting, deleting and updating)

Thank you~