Conditional dumps are invoked when an error occurs
Conditional dumps can be specified in the init.ora file e.g:
event="error trace name dump level level"
Conditional dumps can be specified in the current session:
ALTER SESSION SET EVENTS
'error trace name dump level level';
Conditional dumps can be specified in ORADEBUG:
ORADEBUG EVENT error trace name dump level level ORADEBUG SESSION_EVENT error trace name dump level level