On Thu, Jun 16, 2016 at 01:56:44PM -0500, Kevin Grittner wrote: > On Thu, Jun 16, 2016 at 1:32 PM, Andres Freund <and...@anarazel.de> wrote: > > > With old_snapshot_threshold=1 I indeed can reproduce the issue. I > > disabled autovacuum, to make the scheduling more predictable. But it > > should "work" just as well with autovacuum. > > > > S1: CREATE TABLE toasted(largecol text); > > INSERT INTO toasted SELECT string_agg(random()::text, '-') FROM > > generate_series(1, 10000000); > > BEGIN; > > DELETE FROM toasted; > > S2: BEGIN TRANSACTION ISOLATION LEVEL REPEATABLE READ; > > S2: SELECT hashtext(largecol), length(largecol) FROM toasted; > >> ... > > S1: COMMIT; > > S2: SELECT hashtext(largecol), length(largecol) FROM toasted; > >> ... > > S1: /* wait for snapshot threshold to be passed */ > > S1: VACUUM pg_toast.pg_toast_16437; > >> INFO: 00000: "pg_toast_16437": found 61942 removable, 0 nonremovable row > >> versions in 15486 out of 15486 pages > >> DETAIL: 0 dead row versions cannot be removed yet. > > S2: SELECT hashtext(largecol), length(largecol) FROM toasted; > > ERROR: XX000: missing chunk number 0 for toast value 16455 in > > pg_toast_16437 > > LOCATION: toast_fetch_datum, tuptoaster.c:1945 > > Thanks! That's something I should be able to work with. > Unfortunately, I am going to be on vacation, so I won't have any > results until sometime after 28 June.
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