Assertion Failure dump file

Has anyone had any experience using the dump file created with an assertion failure? I would like to understand what happens during such a failure and how I can pinpoint what is causing the failure. I believe you can use onstat -g ses with the dump file (something like shmem.1db----- onstat -g ses sesid). Unfortunately, if you don't know what the session id was, how can you look. Is there a utility or anything else that can help? Any help is appreciated. Thanks.