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A DDC file can be created from the DDCDB. The command is:

CREATE DDCFILE filename FROM DDCDB

The DDC file will be created in the filename specified.

A DDC DB can be created from a DDC file. The command is:

CREATE DDCDB FROM DDCFILE

This takes the active DDC file that dbvrep has been loaded with (through readddc or --ddfile commands) and loads the settings into the DDC DB.

DDC_BACKUP_DIR 

On every startup of a process a backup of all DDC settings is made into the DDC_BACKUP_DIR directory as a backup, e.g. for use with CREATE DDCDB FROM DDCFILE, or just for reference.