Many IT industry professionals use DB-Engines to track the popularity of database products. The ranking criteria includes measuring the number of references to different products on industry websites, Google searches, job postings, user profiles, and professional and social networks.
It’s important to note that web popularity does not equate to market share and industry-leading sales revenues. Top commercial products such as Microsoft SQL Server and Oracle’s Autonomous Database continue to lead all vendors, including open source database products. But there has been a rise in open source database adoption, creating some competition for proprietary databases.