Fabrice.Sznajderman@devoteam.com writes:
> But I had error :"ERROR: Parent tuple was not found
What PG version is this? We recently fixed some bugs that could lead to
this error.
The error could only occur if you have some old open transaction(s) that
could possibly still see since-updated tuples in the vacuumed table.
So it'll go away if you close out open transactions.
regards, tom lane