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For a serious note, there are occasionally situations where I have to take in a lot of data that I know nothing about. Sooner of the time this data is either in json or readily convertible to json so losing it into a mongodb database and poking around in it is a reasonable preliminary step to whatever the more permanent solution should be.

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Would PostgreSQL + JSONB work for you there?

I assume it could, but haven't tried it.

Allegedly, Mongo is more efficient if you need to ingest billions of records.

I remember when that was true, because MongoDB used to mmap files and skip fsync.

/dev/null is more efficient than just about anything at ingesting billions of records, but not very useful, is it?

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