> > For ODB keys of type TID_KEY, the value num_values IS the number of subkeys. 
> 
> this logic makes sense, however it doesn't seem to be consistent with the printout of the test example
> at the end of https://daq00.triumf.ca/elog-midas/Midas/240203_095803/a.cc . The printout reports 
> 
> key.num_values = 1, but the actual number of subkeys = 6, and all subkeys being of TID_KEY type
> 
> I'm certain that the ODB subtree in question was not accessed concurrently during the test.

You are right, num_values is always 1 for TID_KEYS. The number of subkeys is stored in 

  ((KEYLIST *) ((char *)pheader + pkey->data))->num_keys

Maybe we should add a function to return this. But so far db_enum_key() was enough.

Stefan