On 9/11/07, Heikki Linnakangas <heikki@enterprisedb.com> 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