"dump the call stack if the specified error is cleared"
*Cause: If an unknown module is clearing an error that you expected to
be resignalled, you can use this event to aid your debugging.
Whenever that error is cleared the call stack will be dumped to the
trace file. This only works for non-OS Oracle errors.
Usage: event="10423 trace name context forever, level "
event="10423 trace name context forever, level 28"
Each time ORA-28 is cleared the stack will be dumped.
*Action: Creates a stack dump each time the specified error is cleared.