MemSQL is described as 'Next generation database that removes the most common bottleneck most applications hit today: disk. By offering a familiar relational interface to an in-memory data tier, MemSQL empowers developers with the technology web-scale companies use to cope with massive' and is an app in the business & commerce category. There are more than 10 alternatives to MemSQL for a variety of platforms, including Windows, Linux, Mac, Web-based and SaaS apps. The best MemSQL alternative is PostgreSQL, which is both free and Open Source. Other great apps like MemSQL are MySQL Community Edition, Microsoft SQL Server, Triplit and Amazon Redshift.
SQL server is diskbased not memory based