A recent HN article answers this question, actually! "A basic installation of SAP has 20,000 database tables, 3,000 of which are configuration tables." https:

A recent HN article answers this question, actually! "A basic installation of SAP has 20,000 database tables, 3,000 of which are configuration tables." https://news.ycombinator.com/item?id=22244750 https://news.ycombinator.com/item?id=22244750