Amit Kapila <amit.kapila16@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-jCnacbYvtpptK2A9YYp9Q@mail.gmail.com
regards, tom lane
