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Error [Xoops]: Unable to connect to database in file class/database/databasefactory.php line 34
Check your database settings in mainfile.php
database name
database password
These must match database access settings on your server.
Make sure your database name has the correct and full name; ie if you created a database called "xoops2" many hosts require the full name to be inputted to access this database, so the name will be "something_xoops2" "Something" is often your host account user name used as a prefix.
This Q&A was found on XOOPS Web Application System : https://xoops.org/modules/smartfaq/faq.php?faqid=546