[xwiki-users] Username and Password for Subwiki-Databases

Hi all, I'm running XWiki 6.2 (Oracle-DB / Tomcat7) with two sub-wikis. I learned that for each sub-wiki, a database is created. Does anyone know the username and password for the sub-wiki databases? Are they the same as for the main database? Here's why I'm asking: I'm trying to transfer the wiki including the sub-wikis to a new server, but the XWiki-User is not allowed to create databases there. So I had the admin set up the databases and sent three dumps of the main and sub-wiki databases. After importing, I can't access the wiki, I get an error message like this: SQL Error: 1435, SQLState: 72000ORA-01435: No such user So, basically, the question is: How to transfer a wiki including sub-wikis to a new server?