Working with a WordPress Multisite requires a little bit more knowledge about WordPress and experience as WordPress admin than working with a single site. When you try to fix problems with your WordPress Multisite network, it is sometimes helpful to know how the database of a multisite is structured and what the differences between a Single Site database and a WordPress Multisite database are.
So let’s take a look to which database tables do we have in a single site and which we have in a multisite. We will briefly explain each of the multisite specific tables. If you need an explanation of single site tables, please read the post Database Description in the WordPress Codex.