MariaDB vs Microsoft SQL Server


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MariaDB
One of the most popular database servers. Made by the original developers of MySQL. Guaranteed to stay open source.
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Microsoft SQL Server
SQL Server enables customers to build mission-critical applications and Big Data solutions using high-performance, in-memory technology across OLTP, data warehousing, business intelligence and analytics workloads without having to buy expensive add-ons or high-end appliances. SQL Server uses a common set of tools to deploy and manage databases both on-premises and in the cloud, which makes it easier for customers to take advantage of the cloud with existing skills.
Face to face in the news:


2018 - MariaDB acquires big analytics company MammothDB


MariaDB, known as a drop-in replacement for the popular MySQL database, clearly has its sights set on a bigger market and is looking to expand and better challenge the likes of Oracle and Microsoft SQL Server. Today the company announced that it has acquired MammothDB, a big data business analytics service based in Bulgaria. With MariaDB AX, MariaDB already offers an analytics and data warehousing system. So the company plans to bring the MammothDB’s expertise in this area to bear on MariaDB AX. Thus MariaDB can provide better analytical tools in comparison to Microsoft SQL Server