That's odd. Derby should be used by default if a user did not select any database during installation. Thank you for letting us know. We will look at it.

Derby is in fact used by default in the installer if no changes are made. However error output given by Tigase may be confusing:

Please upgrade database schema now.
Current scheme version is: 4.0, expected: 5.1
Check the schema upgrade guide at the address:
http://www.tigase.org/content/mysql-database-schema-upgrade-tigase-51

A more general blog entry covering also derby and postresql upgrade may be a good idea.

Good idea, we have to fix the error text. The JDBCRepository class which outputs it, have means to detect what database is used. It could use this knowledge to output a different link for each database. Or to simplify, we could point to a general link like: http://www.tigase.org/content/database-upgrade which could have subpages for each database.

Of course we need documentation for each database as well..... The document should cover both manual installation and the schema upgrade.