
"At Open Source Summit Europe in August, the Linux Foundation announced that DocumentDB-a MongoDB-compatible document database built on PostgreSQL-had joined the foundation as a new open source project. This new project, first announced by Microsoft in early 2025, is designed to support developers in deploying databases with their applications quickly and make querying data easier. But this move does make planning around the selection of the document database even harder."
"To start with, we'll look at why you might choose to use a document database over a more traditional relational database. Document databases store data in a format that can be easier to operate using JavaScript Object Notation (JSON). For developers who are not familiar with the intricacies of relational databases or who don't yet know what data schema they will need over time, using a document database can be faster and more effective in their workflow."
MongoDB remains the most popular NoSQL document database, but compatible alternatives such as DocumentDB increase available choices. DocumentDB is MongoDB-compatible, built on PostgreSQL, and joined the Linux Foundation as an open source project after Microsoft announced it in early 2025. The project aims to help developers deploy databases with applications quickly and simplify querying. Document databases store data in JSON, easing operation and accommodating evolving schemas, which benefits rapid prototyping and agile development. MongoDB has garnered tens of thousands of customers, prompting other document database projects and API-compatible services and increasing complexity in infrastructure and deployment decisions.
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