To create Mysql Databases in Plesk 10.x, please follow the following steps :-
1) Login to Plesk control panel.

2) Click on "Subscriptions"

3) Click on Manage Hosting.

4) Click on "Websites & Domains".

5) Click on "Databases".

6) Click on "Add New Database".

7) Fill the reuqired fileds.
Database :
Type : You can select MySql and MSSQL as per your requirment.

8) Click OK and then Click on Add new Database User.

9) Fill the reuqired fileds.
Database User Name:
New Password :
Confirm Password :

10) Click Ok.
