Structure of a transfer package

The transfer package contains three objects that DCM reads and writes as binary: the information file, the preview file, and the contents file or directory. DCM creates these objects in the source database generate_directory when the source database generates a transfer package. The files remain in the generate_directory until the source database receives confirmation that DCM has successfully transferred the files to the destination directory. When the transfer is finished, the transfer files reside in the receive_directory of the destination database. An exception to this situation is when the direct mode transfer mode is used (that is, the source database generates the objects directly in the receive_directory of the destination database). The files remain in the receive_directory directory until DCM successfully loads them into the destination database.

The package contents file or directory can contain up to five parts:

The transfer file names have this syntax:

   <FROM_DB_ID><TSET_NUMBER><TO_DB_ID><TIME><name>

where name is: dcm_info.txt for the DCM information file, dcm_preview.txt for the DCM preview file, .tar.gz for compressed package contents, and.dcm for extracted contents. The portion of the name that precedes name is identical for all files that are part of a given transfer package.


Feedback