09/21/87 mrds Known errors in the current release of mrds. # Associated TR's Description 169 phx20856 When mrds is updating the segments in the resultant_segs.dir it can get a no_write_permission fault. This happens when the person is a DBA (sma access on the database dir), but doesn't have write permission on the segments. The copy_resultant_data module should check for this before trying the update. 168 phx20271 This error occurs with MR11 mrds but is fixed with MR12 mrds. See the TR for complete details. If preventive scope is set with MR11 mrds, the problem doesn't occur. 167 phx18744 When a check_proc determines that a domain value isn't acceptable, mrds prints an error message and doesn't do the store or modify. The error message should also include the name of the attribute because there is ambiguity when more than one check_proc is associated with a tuple. 166 phx20850 When dsl_$compile is processing run time ".X." arguments, it incorrectly handles char varying and bit varying. The solution is for mrds_dsl_translate to set the argument pointer to the beginning of the length word, instead of at the beginning of the bit or character strinng. 165 phx20666 If you give an unrecognized control arg to rmdb's ready_db request you get the error_table_$bad_arg error message instead of error_table_$badopt. 164 phx15756 When a conversion error occurs during a data conversion, the details are a bit lacking in the sub_err_ call. This TR suggests that the error message should also specify which datum couldn't be converted. 162 phx19173 When the trouble switch of a database gets turned on, people who currently have the database open are still allowed to set scope. The trouble switch setting only prevents new people from opening the database. 147 phx19911 MRDS needs to find out that the data management system isn't available, at open time. Currently it doesn't find out until set scope time, and then closing the database to recover from dm_not_available_ runs into the same problem because the close operation requires a transaction to be in progress. 128 Selection expression parsing needs to generate better error messages. 102 When mrds creates the saved resultant directory in the database, it only gives read acls to the creater of the saved resultant and the SysDaemons. This means that most people who use the database will not be able to use the saved resultant. Mrds should give acls to whoever is allowed to open the database. A somewhat related problem is that mrds creates the saved resultant with the ring brackets of the creating process. If another DBA in a higher ring tries to open the database after this, mrds tries to recreate the saved resultant and fails. This produces a warning message that may affect a linus user. 101 When translating a selection expression, mrds will incorrecly match any left subset of the name. Thus if the database contains a relation named my_relation, the selection expression "-range (x my_re) -select x" will select it as will ones using m, my, my_, my_rel, etc. When two or more relations match the left subset, mrds will choose the first it finds in its internal tables. 97 dmdbp terminates prematurely when it encounters a relation the user does not have read access on even though there are other relations he does not have access to. 85 In the cmdb listing, the options used in the db creation are not properly included in the "Options: " line. 83 phx14522 When a relation has ring brackets set up to allow, for example rw in ring 4 and r in ring 5 (rb 4 5 5), and the DBA is in ring 5, the attempt is made to force rw access to the relation, resulting in a not-in-write-bracket condition. The program determining this is mu_get_relation_acl. He should either a) look at the raw access (as opposed to effective access which considers rbs,) b) have a handler for not_in_write_bracket around the call to mrds_dm_authorization$set_needed_access or c) have such a handler in mrds_dm_auth_etc... 81 The number of and-groups that linus can have is around 30 instead of the maximum of 100. The problem is that linus creates a mrds selection expression of the form: (((G1) | (G2)) | (G3)) which causes the node stack in the optimize to overflow. THe stack is based on max_pred_depth. 80 setting a permit scope of modify also sets a permit scope of retrieve 65 mu_sec_make_res does not properly diagnose no_execute_permission. 63 The file model is constructed such that several 18-bit offsets are not word or even half-word aligned. In particular the rel_ptr spans a word boundary. This apparently causes significant performance degradation. To fix it would cause an incompatible change, but it should be done. 62 The following modules do not respect the directory specified by set_mrds_temp_dir: cmdb, rmdb and (apparently) dmdm. If this fix is made, the smtd needs to be changed. It currently states that it only affects openings. We consider this to be a design flaw. 50 The variable CFLD59_DESC in mis-declared (packed bit on) in both mrds_builtin_ and mrds_v1_builtin_. 28 dmdsm The cmdsm command does not detach the submodel. Several invocation of the command will overflow the pdir or pat. 18 mrds_dsl_store expects that the relation name be a character string. Since we now allow stores into temp rels still is not always the case. Note that if the temp rel index is converted into a character string stores can be done but it should not be necessary to do the conversion. 2 phx08878 cmdsm can no longer accept 2 submodel relations defined from the same model relation. cmdsm can be made to accept a submodel that defines multiple submodel relations over the same model relation. The problem is that the use of such a submodel can cause problems. For instance concurency control is based on the model relation what happens when two different scopes are set on the different submodel relations ? In order for mrds to handle this its entire scoping scheme would have to be redesigned. Rather than allow strange things to happen during application package execution it was felt that no permitting the submodel to be created would be better. ----------------------------------------------------------- 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. 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