There are at least three reasons why the open source community is paying attention to DocumentDB. The first is that it combines the might of two popular databases: MongoDB (DocumentDB is essentially an open source version of MongoDB) and PostgreSQL. A PostgreSQL extension makes MongoDB’s document functionality available to Postgres; a gateway translates MongoDB’s API to PostgreSQL’s API.
Secondly, the schemaless document store is completely free and accessible through the MIT license. The database utilizes the core of Microsoft Azure…

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