Mikko Partio napsal(a):
On Tue, Apr 8, 2008 at 1:45 PM, Zdenek Kotala <Zdenek.Kotala@xxxxxxx> wrote:
Mikko Partio napsal(a):
Should I try remove one of the duplicate rows from pg_class?
Try it with caution. You should use ctid column to refer to exact row.
Try before:
select oid, ctid, xmin, xmax, cmin, cmax, relname from pg_class where oid
= 294397;
If both row are identical or not.
# select oid, ctid, xmin, xmax, cmin, cmax, relname from pg_class where oid
= 294397;
oid | ctid | xmin | xmax | cmin | cmax | relname
--------+-----------+------------+------------+------+------+--------------
294397 | (1125,36) | 3944654557 | 0 | 35 | 35 | abc
294397 | (1124,55) | 3943984380 | 3943984642 | 3 | 3 | abc
(2 rows)
Which one should I remove? What is the worst case scenario for the delete?
The database is 1,5TB so I would rather not restore it from backups :-)
(1124,55) is deleted one. This row should not be visible. But it seems a problem
with visibility - transaction wraparound. Do you have any warning message in the
log about vacuuming? Or clog corruption when transaction 3943984642 is marked as
rollbacked.
Zdenek
