Go with SAP DB 7.4:

- Runs on Windows, Linux, Solaris, AIX, Tru64, HP-UX
- Partnered with MySQL AB
- Open Source (ie. it's free !)
- SQL based (ISO/ANSI SQL 92 Standard)
- 2000 small, medium and large installations (up to 5500 users)
- Round-the-clock operation
- Easy administration
- Free of reorganization tasks
- Unlimited number of users
- Unlimited database size
- Distributable under the GPL/LGPL
- No license fees

http://www.sapdb.org/


>Hi everyone
>
>My friend give me a suggestion, updrage my system database from .DBF to SQL one.
>
>Most of my client are mid/small size company, which SQL is low-price and avalibale ?
>
>And ... you guys had change to SQL ?
>
>
>thx