Note: PostgreSQL automatically and transparently compresses large variable 
length column values.

https://www.postgresql.org/docs/9.6/static/storage-toast.html

John DeSoi, Ph.D.


> On Jul 17, 2017, at 12:10 AM, David Adams via 4D_Tech <[email protected]> 
> wrote:
> 
> The jsonb type restructures the JSON into a
> custom binary format for index optimization. Not to save space, but to make
> searches possible, flexible, and fast.

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