Gaetano Mendola wrote:

# vacuum full verbose url; INFO: vacuuming "public.url" INFO: "url": found 74 removable, 21266 nonremovable row versions in 8550 pages DETAIL: 2 dead row versions cannot be removed yet. [SNIP] INFO: "url": moved 11 row versions, truncated 8550 to 8504 pages


and in the next run:


# vacuum full verbose url; INFO: vacuuming "public.url" INFO: "url": found 13 removable, 21264 nonremovable row versions in 8504 pages DETAIL: 0 dead row versions cannot be removed yet. [SNIP] INFO: "url": moved 5666 row versions, truncated 8504 to 621 pages

If page number 8549 was the one being held, I don't think vacuum can truncate the file. The empty space can be re-used, but the rows can't be moved to a lower page while a transaction is using them.


--
  Richard Huxton
  Archonet Ltd

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