In view of backups, database edits, server hostname, username, password or database name alterations you need to work with MySQL.
In case you don’t know database credentials, but have FTP access you need to find Magento database access details.
Once the changes are made, save the newly assigned values. To monitor all the backend activities, apply Magento access logs.
Don’t forget to save the updates.
!!! Having dealt with migration, all the values should be adjusted to the new database information.