Re: can't shrink relation - Mailing list pgsql-hackers

Gavin Sherry <swm@linuxworld.com.au> writes:
> I am getting a NOTICE in logs about once a day:
> NOTICE:  Rel s: TID 212/16: DeleteTransactionInProgress 0 - can't
> shrink relation

AFAICT, the only way to get that message is if you have a tuple with
good (committed) t_xmin, but t_xmax is 0, and yet HEAP_XMAX_INVALID
is not set.  Bizarre.  Does the tuple appear valid otherwise?
(Try "select * from s where ctid = '(212,16)'" to view it.)

> Moreover, this error is occuring in the same database I reported as
> saying 'Relation pg_shadow does not exist' the other day.

You've got something mighty weird going on there.  Possibly time for
a dump/initdb/reload.  Possibly time to run some memory & disk
diagnostics.
        regards, tom lane