What are some alternatives?
When comparing Datomic and MySQL, you can also consider the following products
ElasticSearch - Elasticsearch is an open source, distributed, RESTful search engine.
PostgreSQL - PostgreSQL is a powerful, open source object-relational database system.
HTTP Commander - Web file access system for your Active Directory users and Windows file system. Must have for educational and other organisations with Windows users.
SQLite - SQLite Home Page
Microsoft SQL Server - Microsoft Azure is an open, flexible, enterprise-grade cloud computing platform. Move faster, do more, and save money with IaaS + PaaS. Try for FREE.
Oracle DBaaS - See how Oracle Database 12c enables businesses to plug into the cloud and power the real-time enterprise.