Hi,
Small Business Edition (SBE) comes with limited features and support up to 250 clients.
Enterprise Edition (EE) comes with many more advanced features and support upto 80,000 clients per SEPM.
In SBE you won't find option to configure database log size.
Refer this article to learn more differences between EE & SBE
https://www-secure.symantec.com/connect/articles/feature-comparison-between-sep-121-sbe-and-ee