From cloud developers working to incorporate databases with their deployments to enterprises that want more flexibility from their data repositories, open source databases are flourishing. As a matter of fact, DB-Engines is out with its annual ranking of databases, based on popularity, and all three top databases and tools for 2014 are open source.
MongoDB took the number one spot, as it has before, and Redis, used for managing data, and Elasticsearch, which helps developers build their own search engines, are runners up. If you think the Big Data trend begins and ends with Hadoop, think again.
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