edktool Command-Line Tool > Eduction Parameters > Databases

Databases
The names of the databases to which a document belongs. Eduction runs only on documents that belong to the comma-separated list of databases. If you do not list databases, Eduction is run on documents from all databases.
 
NOTE If an IDX does not have a DREDBNAME entry for a document, matching is not done on that document. However, if all databases are selected, matching is done.