Thanks, this is exactly what I was thinking.
--- "Michael G. Martin" <michael@vpmonline.com> wrote:
> You then remove a bunch of old tuples. Space is still X+Y. You now
> have 2 basic options:
>
> 1. Run a vacuum full -- this locks the entier table, and de-fragments
> all unused space, so space is now back to X. Table will grow incremently
> by Y over the next 6 months again.
> 2. Run a lazy vacuum-- no lock, no de-fragment, space is still X+Y.
> Assuming max_fsm_pages was large enough to hold all the changed pages,
> over the next 6 months, the space remains fixed at about X+Y. You are
> now re-using the unused table space.
>
> Either solution will work. If you really want to cut disk space, choose
> 1. If you want to keep the space at about it optimal size and avoid any
> downtime, choose 2.
>
> --Michael
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