Thread:Project:Support desk/How i can delete User?/reply (3)

If you want to do that in the database, the easy way is to go to the table "user" and to delete all the users, which you do no longer want. You can do that, but this is relational data. Meaning: MediaWiki does not only use it for the usernames, but also associates posts and other stuff with these table rows. If you just remove them without checking, if they are still used anywhere else, you will break your wiki.

A rather clean solution, which I found very usable, is Extension:User_Merge_and_Delete. It takes care for those references automatically. This drastically reduces the risk of screwing up your wiki.