08/14/84  display_mrds_db_status, dmdbs

Syntax as a command:  dmdbs path {-control_args}


Function:  This command displays the current state of the data base
concurrency control segment.  The number and type of open users of the
data base can be determined from its output.  The current scope
settings on all relations in the user's view can be displayed.


Arguments:
path
   is the relative or absolute pathname of the data base, or of a
   submodel defined for that data base, for which concurrency control
   information is desired.  If both a data model and submodel of the
   same name are in the same directory, the model will be found if no
   suffix is given.


Control arguments:
-brief, -bf
   causes display of only the current number of open users and the
   number of active scope users of the data base.
-long, -lg
   causes all possible concurrency control information to be displayed
   that is in the user's view.  This includes the concurrency control
   version, whether the data base has been quiesced, consistency state
   of the data base control segment, existence of any dead processes,
   identification of the processes having the data base open, and what
   scope they have set on relations that are in the user's view.
-proc_id process_number, -pid process_number
   same as is used for -user, but the process number is used for the
   identifier instead.


-user person.project, -user person
   causes all possible concurrency control information (such as -long)
   for the person.project or person given to be displayed, including
   scope setting on relations in the user's view.


Notes:  If no control arguments are specified, then an abbreviated form
of the information given by the -long option is presented.

The output display does not include "normal" conditions, such as
"Activation:  normal".  Only exception conditions or necessary
information are displayed (e.g., "Non-passive scope set by a dead
process.", or "open users:  0") unless the -long option is specified.


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Historical Background

This edition of the Multics software materials and documentation is provided and donated
to Massachusetts Institute of Technology by Group BULL including BULL HN Information Systems Inc. 
as a contribution to computer science knowledge.  
This donation is made also to give evidence of the common contributions of Massachusetts Institute of Technology,
Bell Laboratories, General Electric, Honeywell Information Systems Inc., Honeywell BULL Inc., Groupe BULL
and BULL HN Information Systems Inc. to the development of this operating system. 
Multics development was initiated by Massachusetts Institute of Technology Project MAC (1963-1970),
renamed the MIT Laboratory for Computer Science and Artificial Intelligence in the mid 1970s, under the leadership
of Professor Fernando Jose Corbato. Users consider that Multics provided the best software architecture 
for managing computer hardware properly and for executing programs. Many subsequent operating systems 
incorporated Multics principles.
Multics was distributed in 1975 to 2000 by Group Bull in Europe , and in the U.S. by Bull HN Information Systems Inc., 
as successor in interest by change in name only to Honeywell Bull Inc. and Honeywell Information Systems Inc. .

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Permission to use, copy, modify, and distribute these programs and their documentation for any purpose and without
fee is hereby granted,provided that the below copyright notice and historical background appear in all copies
and that both the copyright notice and historical background and this permission notice appear in supporting
documentation, and that the names of MIT, HIS, BULL or BULL HN not be used in advertising or publicity pertaining
to distribution of the programs without specific prior written permission.
    Copyright 1972 by Massachusetts Institute of Technology and Honeywell Information Systems Inc.
    Copyright 2006 by BULL HN Information Systems Inc.
    Copyright 2006 by Bull SAS
    All Rights Reserved