Tom Lane kirjoitti:
> I'm also concerned about loss of debug traceability if these fields
> disappear entirely from disk --- it's been handy more than once to be
> able to tell where in a complex transaction something happened.
>
Sure. We'll just have to try to compensate that with debug messages
etc., whatever scheme we choose.
> Lastly, at least on machines with 8-byte MAXALIGN, removing four more
> bytes from heap headers would save nothing. So I'm not excited about
> going through enormous pushups to get rid of both fields, when a far
> simpler and better-performing mechanism suffices to remove one.
>
It would be a win on 32-bit architectures. And there has been discussion of
storing at least some data types unaligned.
-- Heikki LinnakangasEnterpriseDB http://www.enterprisedb.com
