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A comment on Amazon DocumentDB, with MongoDB compatibility. Parent comment

Re:Amazon DocumentDB, with MongoDB compatibility by moltar on Wednesday January 09, 2019 @09:23PM (#18871002)
Wasn’t latest Mongo built on Postgres backend too?
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Re:Amazon DocumentDB, with MongoDB compatibility by sbr464 on Wednesday January 09, 2019 @09:32PM (#18871041)
I think your thinking of the BI Connector for analytics/SQL compatibility.

From the docs:

Changed in version 2.0: Version 2.0 of the MongoDB Connector for BI introduces a new architecture that replaces the previous PostgreSQL foreign data wrapper with the new mongosqld.

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Re:Amazon DocumentDB, with MongoDB compatibility by manigandham on Wednesday January 09, 2019 @09:26PM (#18871018)
No, MongoDB has its own storage engines, it's not built on top of anything else.
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