On Thu, 2025-11-13 at 13:30 -0600, Jim Nasby wrote:
> At [1], the docs state that table rewrite ALTERs result in the relation appearing
> empty after the ALTER if another transaction had already taken a snapshot before
> the ALTER. A simple test with a repeatable read (or serializable) transaction
> confirms this... but is there any other situation where a snapshot would be taken?
Snapshots are taken at the start of a statement (or, with REPEATABLE READ and
SERIALIZABLE) at the beginning of the first statement in the transaction.
What do you mean with an "other" situation?
Yours,
Laurenz Albe