Re: Extended Prefetching using Asynchronous IO - proposal and patch

On Thu, May 29, 2014 at 6:19 PM, Tom Lane <tgl@sss.pgh.pa.us> wrote:
> Claudio Freire <klaussfreire@gmail.com> writes:
>> Didn't fix that, but the attached patch does fix regression tests when
>> scanning over index types other than btree (was invoking elog when the
>> index am didn't have ampeeknexttuple)
>
> "ampeeknexttuple"?  That's a bit scary.  It would certainly be unsafe
> for non-MVCC snapshots (read about vacuum vs indexscan interlocks in
> nbtree/README).


It's not really the tuple, just the tid