The description file contains a complete description of the database in encoded form. The description file is used to compile Enterprise Database Server system software and user programs. The description file has the following name:

DESCRIPTION/<database name>

If a DASDL UPDATE compilation increases the database update level, the old description file is backed up using a WFL job generated by DASDL, and is located under the same usercode and on the same pack as the new description file. This old description file is backed up as

DESCRIPTION/<database name>/<old update level> 

The old update level designation is the update level of the old description file.