On Tue, 2023-03-28 at 14:24 -0400, Kirk Wolak wrote: > > I cringe at the thought of using CTID. And while it's probably "safe enough" > inside a single transaction. I doubt that there is much "testing" of this > concept.
It is safe to assume that the CTID is stable within a single transaction only if you use REPEATABLE READ or better transaction isolation level. With READ COMMITTED, you see updated rows (and consequently changed CTID) within a single transaction. And if you use SELECT ... FOR UPDATE, you could even see a changed CTID within a single statement. So don't use CTID to identify rows unless you use REPEATABLE READ or better. Yours, Laurenz Albe
