yeah, but lately those don't get very far
hit/miss if the data that comes back is accurate
another angle to consider here, any way to dump the current undo tablespace structures for analysis similar to mining redo log change vectors
thinking of writing a testcase to heavily exercise this scenario, crash the box, and then go shopping for a fractured block with dbv, once identified then look for affected rowid's in redo dump
but to be complete, would need a method to dump the undo as well which I've never done