On 9/11/07, Heikki Linnakangas <[EMAIL PROTECTED]> wrote: > > > > We're only changing the offsetnumber part of it, which is 2 bytes. That > shouldn't cross a hardware sector boundary on any reasonable hardware. > > Not entirely true if we consider line pointer redirection, which involves changing 4 bytes. You can argue that for quick pruning we don't do any line pointer redirection though.
Also my worry about dealing with unreachable heap-only dead tuples remain. We may need to do far more work to identify that they are not part of any reachable HOT chain and hence can be removed. Thanks, Pavan -- Pavan Deolasee EnterpriseDB http://www.enterprisedb.com