All the operations carried out in DIRA2 refer to a series of files which contain the information about the catalogues and the definitions of the system. The files are in the [DIRADATA] directory and are managed by the data base administrator. When a Personal Data Base is created, empty system files are created in the user directory. These files can be filled and managed by PDB_MANAG command. When an user selects data from an existing catalogue and write a new catalogue in the PDB, all the required information are automatically written inside the system files.
The system files are:
The relationships between the data within the system files are updated when new catalogues are written. So, if a command is interrupted by a wrong user action or by a system crash this file can loose the internal pointers. The command PDB_PACK will rebuild the pointers of these files.