| From: | Robert Haas <robertmhaas(at)gmail(dot)com> |
|---|---|
| To: | Andres Freund <andres(at)anarazel(dot)de> |
| Cc: | Mark Dilger <mark(dot)dilger(at)enterprisedb(dot)com>, Dilip Kumar <dilipbalaut(at)gmail(dot)com>, Peter Geoghegan <pg(at)bowt(dot)ie>, PostgreSQL-development <pgsql-hackers(at)postgresql(dot)org> |
| Subject: | Re: new heapcheck contrib module |
| Date: | 2020-07-31 19:16:39 |
| Message-ID: | CA+Tgmobg_M3zcL=PepSubVtgG6m4Cw_zR48eqDavySwKHeE83Q@mail.gmail.com |
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| Lists: | pgsql-hackers |
On Fri, Jul 31, 2020 at 3:05 PM Andres Freund <andres(at)anarazel(dot)de> wrote:
> The page could have been wrongly marked all-frozen. There could be
> interactions between heap and toast table that are checked. Other bugs
> could apply, like a broken hot chain or such.
OK, at least the first two of these do sound like problems. Not sure
about the third one.
> > If we do need to do something special in terms of advertising xmin,
> > how would you do it? Normally it happens by registering a snapshot,
> > but here all we would have is an XID; specifically, the value of
> > relfrozenxid that we observed.
>
> An appropriate procarray or snapmgr function would probably suffice?
Not sure; I guess that'll need some investigation.
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company
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