I recently signed up for free Enterprise license for evaluation .
One of our requirement is to retrieve data from SQL Server which I checked from documentation can possible from datainputs option, though I can't find any option for defining database as a data source .
I checked following link , comparison sheet of enterprise and free license where datainput doesn't mentioned which I believe mean is it offered to everyone irrespective of your license. http://www.splunk.com/view/SP-CAAAE8W
Please assist me if I am missing something or confirm in case this is not available for free license.