AutoCAD Electrical toolset maintains a database for a project, stored in Microsoft Access format that is used to speed up reports and certain project-wide operations. This file is for temporary use only. If the project database file is missing or corrupted, it is automatically generated from the drawing set of the project.
The project database updates automatically when a drawing is saved by the Project Database Service (PDS). The PDS automatically updates the project database without your intervention as a background process. Edits to the project database can be used to update attribute values on components in the project drawings. To make sure your edits are not lost when PDS updates the database, edit a copy of the database and import the changes from the database copy. The following tables can be edited and imported back to the drawings: