SqlPermissions is a tool used to calculate the precise minimal permissions necessary for an application using a database. It works in an online fashion by monitoring active connections, or offline by using a sql trace; in both cases each trace event is used to determine a permission grant for every monitored statement. It currently is targeted to work against SQL Server 2012 and 2014, though should be backward compatible with most older SQL Server products after 2005. It does not work with other DBMS's. Though the approach is sound, a different implementation would be required to work with other database platforms.
more here...........https://github.com/iSECPartners/sqlperms
more here...........https://github.com/iSECPartners/sqlperms