12/20/86 display_data_model, ddm, dmdm Syntax: ddm {-control_args} Function: Displays the model definition of a MRDS data base, including domain, attribute, and relation information. Control arguments: -attribute {modifier}, -attr {modifier} displays attribute information. The modifier may be name(s) or -unreferenced (-unref). If name(s) is supplied, information for the attribute name(s) is displayed. If -unreferenced is supplied, attribute information about all unreferenced attributes is displayed. If no modifier is supplied, attribute information about all attributes is displayed. -brief, -bf specifies that the brief format be displayed. This argument is incompatible with -names. -cmdb specifies that the output be in the same format as an input source text for create_mrds_db. If the -output_file control argument is included in the invocation, then the segment can be used to create another data base with the same definitions. Only the -brief, -long, and -output_file control arguments can be used with this control argument. -crossref {type}, -xref {type} displays an information cross-reference. The type may be domain (dom), attribute (attr), or all. If the type is domain, each domain is listed with a list of attributes in which the domain is referenced. If the type is attribute, each attribute is listed with a list of relations in which the attribute is referenced. If the type is all, both domain and attribute cross-references are displayed. (Default is "all".) See the examples below which show the information displayed. -domain {modifier}, -dom {modifier} displays domain information. The modifier may be name(s) or -unreferenced (-unref). If name(s) is supplied, information for the domain name(s) is displayed. If -unreferenced is supplied, domain information about all unreferenced domains is displayed. If no modifier is supplied, domain information about all domains is displayed. -header, -he displays data base header information. -history, -hist displays restructuring history information. If the data base is restructured more then once, the history entries are displayed in reverse chronological order. -index names, -ix names displays information about indexed relations for the relation names supplied. If no names are supplied, then information about all indexed relations is displayed. -long, -lg specifies that the long format be displayed. This argument is incompatible with -names. -names, -nm displays the format of domains, attributes, relations, and indexed relations as a list of the names. This argument is incompatible with -brief or -long. -no_header, -nhe prevents display of the header information. (Default) -no_output_file, -nof writes the output to the terminal. (Default) -output_file path, -of path writes the output to path, rather than to the terminal. -relation names, -rel names displays relation information for the relation names supplied. If no names are supplied, the relation information about all relations is displayed. -temp_dir path specifies that the directory indicated by path be used for temporary storage. Notes: If no control arguments are supplied, the default relation information is displayed. Examples: If the data base "little" is created from the source: domain: code fixed bin, address char(20); relation: zip(code* address); the results would be as follows: display_data_model -long DATA MODEL FOR DATA BASE >udd>Demo>dbmt>db7>jg>little.db Version: 4 Created by: User.Multics.a Created on: 05/14/80 1042.9 mst Wed Total Domains: 2 Total Attributes: 2 Total Relations: 1 RELATION NAME: zip Number attributes: 2 Key length (bits): 36 Data Length (bits): 216 ATTRIBUTES: Name: code Type: Key Offset: 0 (bits) Length: 36 (bits) Domain_info: name: code dcl: real fixed binary (17,0) aligned Name: address Type: Data Offset: 36 (bits) Length: 180 (bits) Domain_info: name: address dcl: character (20) nonvarying unaligned display_data_model -cmdb -long . . . /* Created from >udd>Demo>dbmt>db7>User>little.db 06/14/82 1251.3 mst Wed */ domain: address character (20) nonvarying unaligned, code real fixed binary (17,0) aligned; relation: zip (code* address); ----------------------------------------------------------- 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. . ----------------------------------------------------------- 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. 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