SQL server type - You can choose SQL server type: Microsoft SQL, Oracle Database, MySQL server, IBM DB2 Universal Database etc.
Note: when you switched to the "Embedded SQL storage engine", your pldbuser's password will be set to default password. You should change the default password to your own to avoid unauthorized access to your data! Please go to the "Storage Options" tab to do this. The sa's password for the Embedded SQL storage engine remains unchanged.