Perhaps I am missing something, but the documentation on external storage appears remarkably sparse. It says it is better for substring searches, but otherwise doesn't say very much.
I have a table with two modest-length bytea fields (around 9K and 2K respectively) of already compressed data. I was looking for a clue as to whether or not these should use external storage - I suspect they should but I didn't see anything that gave me a definite answer.
I'd prepare doc updates on this if they were required but I don't have the requisite knowledge, nor time right now to go trawling endlessly to acquire it.
cheers
andrew
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