Microsoft SQL Server
Say what you may about Microsoft, but its profitability exceeds all other tech companies, and SQL Server helped put it there. Sure, Microsoft's desktop operating system is everywhere, but if you're running a Microsoft Windows-based server, you're likely running SQL Server on it.
SQL Server's ease of use, availability and tight Windows operating system integration makes it an easy choice for firms that choose Microsoft products for their enterprises. Microsoft promotes the latest release, SQL Server 2016, as theplatform for both on-premises and cloud databases and business intelligence solutions.
Microsoft also touts SQL Server 2016 in helping enterprises build mission-critical applications with high-performance, in-memory security technology across OLTP (online transaction processing), data warehousing, business intelligence and analytics.