USER AND SERVER CONFIGURATION
You can use the hidden view $MultiDbIndex in the Domain Catalog to find the sizes of all databases selected for indexing. You can also use this view to find out which of these databases have already been indexed individually by their database managers -- and use full-text index size as a more accurate indicator of the space a database will take up in the Domain Index.
1. From the IBM® Lotus® Domino® Administrator, choose File - Application - Open.
2. Select the cataloging server for the domain, and then select Domain Catalog.
3. Hold down CTRL-SHIFT and click Open.
4. In the view pane, click ($MultiDbIndex).
5. For each database listed, double-click the database entry to display the Database Entry document.