I believe large columns get put into a TOAST table. Max page size is 8k. So
you'll have lots of pages per row that need to be joined with a size like
that: https://www.postgresql.org/docs/9.5/static/storage-toast.html
*Aldo Sarmiento*
President & CTO
8687 Research Dr, Irvine, CA 92618
*O*: (949) 223-0900 - *F: *(949) 727-4265
aldo(at)bigpurpledot(dot)com | www.bigpurpledot.com
On Thu, Oct 19, 2017 at 2:03 PM, Cory Nemelka <cnemelka(at)gmail(dot)com> wrote:
> I have getting very poor performance using libpq to process very large
> TEXT columns (300MB+). I suspect it is IO related but can't be sure.
>
> Anyone had experience with same issue that can help me resolve?
>
> --cnemelka
>