Andres Freund <and...@2ndquadrant.com> writes:
> On 2013-12-01 17:15:31 -0500, Tom Lane wrote:
>> Is there really a significant risk of clog access errors due to this bug?
>> IIUC, the risk is that tuples in pages that vacuum skips due to being
>> all-visible might not be frozen when intended.
> Unfortunately it's not actually too hard to hit due to following part of the
> code in vacuumlazy.c:
> /*
> * If we're not scanning the whole relation to guard against XID
> * wraparound, it's OK to skip vacuuming a page. The next vacuum
> * will clean it up.
> */
Ah. So it's only been *seriously* broken since commit bbb6e559c, ie 9.2.
regards, tom lane
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