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MySQL
MySQL Server, the world's most popular open source database, and MySQL Cluster, a real-time, open source transactional database.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
MySQL databases were developed in 1995 while looking for a more performant and efficient data storage mechanism. In 2000, MySQL was released under the GNU General Public License (GPL). MySQL AB, the company that owns the copyright of MySQL, actively works on improving the product and offering support.
Elastic NV is the company behind many products, such as Elasticsearch, Kibana, and Logstash. These three products together form the ELK stack. Their most popular product Elasticsearch is a distributed, multitenant-capable full-text search engine, which also offers an API to query data. Elasticsearch is used by many large-scale organizations, such as Netflix, Tinder, and Wikipedia, for its performant searching capabilities.
We’ve already introduced Apache as part of the LAMP stack, which also includes MySQL. The Apache HTTP Server software exists since 1996. Some say that over 67% of all web servers in the world make use of Apache HTTP Server. Though, its popularity is declining as alternatives are coming out that demand some part of the market share, such as Nginx.