Because error messages are updated frequently, documentation is
    provided in the following text files:

    o  SQL messages:

       In SYS$HELP:SQL$MSGnn.DOC

       where nn is the current version number for Oracle Rdb.

       This file contains the same text as the Help Errors help topic
       in interactive SQL.

    o  RDB messages:

       In SYS$HELP:RDB_MSGnn.DOC

       where nn is the current version number for Oracle Rdb.

    o  RDMS messages:

       In SYS$HELP:RDMS_MSG.DOC

    o  COSI messages:

       In SYS$HELP:COSI_MSG.DOC

    o  SQL/Services messages:

       In SYS$HELP:SQLSRV$MSG.DOC

    o  Repository messages:

       In SYS$HELP:CDD_MSG.DOC

    The message documentation for all the facilities follows the same
    format, with messages alphabetized by message name. After the
    message name and text, the documentation includes an explanation
    and suggested user action.

    The online message documentation files may be updated even if
    you do not install a new version of SQL. In particular, any
    installation of Oracle Rdb databases may replace the RDB_MSG.DOC
    file with one that is more up-to-date.

    You can print the online message documentation files for
    reference. In addition, you can search the files for the message
    information you need.