Updating a Search Database: Refresh vs. Rebuild
If the contents of an archive folder change, you must either refresh or rebuild the search databases that reference those archive folders to make the changes available in OL Connect Search.
A refresh of a database can only add information on new files added to archive folders since the last refresh. It cannot remove any information from the database. This means that files deleted from an archive folder continue to appear as entries in the search database, even though the associated PDF source files are no longer available for viewing or printing. In this case you must rebuild the database to have it reflect the current state of the archive folders.
A rebuild of a search database rebuilds it from scratch. Thus when you rebuild a database, you can change the archive folders you want to include in the database.
See Refresh the Contents of a Database and Rebuild the Contents of a Database for help refreshing and rebuilding a database.