Amit Kapila <amit.kapil...@gmail.com> writes: > Even if the relation is locked, background processes like checkpointer > can still touch the relation which might cause problems. Consider a > case where we extend the relation but didn't flush the newly added > pages. Now during truncate operation, checkpointer can still flush > those pages which can cause trouble for truncate. But, I think in the > recovery path such cases won't cause a problem.
I wouldn't count on that staying true ... https://www.postgresql.org/message-id/ca+hukgj8nrsqgkzensnrc2mfrobv-jcnacbyvtpptk2a9yy...@mail.gmail.com regards, tom lane
