== Debian 7 ==
I exported mysql databases from another server, using the command
mysqldump --all-databases >db.sql, and then imported them into my server's mysql, using the command
mysql <db.sql and in doing so have overwritten my own mysql database.
Luckily for me, no virtual server actually uses their database, so I can remove, re-create in Virtualmin, but there are several wordpress installations with their own databases. I tested a Wordpress installation which still seemed to work, but I don't know where the permissions on these databases lie, so I don't know how much damage I've done.
Needless to say, I don't have a backup.
1) How can I restore/re-create the default user database? 2) Why do the Wordpress installations still work?
Many thanks, Steve