Re: Memory Alignment in Postgres

On Wed, Sep 10, 2014 at 11:43:52AM -0400, Robert Haas wrote:
> But there are a couple of obvious problems with this idea, too, such as:
> 
> 1. It's really complicated and a ton of work.
> 2. It would break pg_upgrade pretty darn badly unless we employed some
> even-more-complex strategy to mitigate that.
> 3. The savings might not be enough to justify the effort.
> 
> It might be interesting for someone to develop a tool measuring the
> number of bytes of alignment padding we lose per tuple or per page and
> gather some statistics on it on various databases.  That would give us
> some sense as to the possible savings.

And will we ever implement a logical attribute system so we can reorder
the stored attribtes to minimize wasted space?

--  Bruce Momjian  <bruce@momjian.us>        http://momjian.us EnterpriseDB
http://enterprisedb.com
 + Everyone has their own god. +