Please select the DB you want to use.

cubrid	Use CUBRID as database. See manual for more info
firebird	Use Firebird as database. You can create database with (create database "/path/dbname.fdb" page_size=8192 default character set UTF-8;)
mssql	Use MSSQL as database
mysql	Use MySQL as database with mysql*() functions in php. Transactions will not be processed since DB file is created in myisam.
mysql_innodb	Use MySQL as database with innodb. Transactions will be processed with innodb
mysqli	Use MySQL as database with mysqli*() functions in php. Transactions will not be processed since DB file is created in myisam
postgresql	Use PostgreSql as database.
sqlite2	Use sqlite2 as database which saves the data as files. DB file must not be accessible from the web. (Never been tested for stabilization)
sqlite3_pdo	Use sqlite3 as database with supports from PDO of php. DB file must not be accessible from the web.