Re: Question regarding the database page layout.

From: Gregory Stark <stark(at)enterprisedb(dot)com>
To: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Ryan Bradetich" <rbradetich(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: Re: Question regarding the database page layout.
Date: 2008-09-02 15:37:37
Message-ID: 87r682sgn2.fsf@oxford.xeocode.com
Views: Raw Message | Whole Thread | Download mbox | Resend email
Thread:
Lists: pgsql-hackers

Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> writes:

> "Ryan Bradetich" <rbradetich(at)gmail(dot)com> writes:
>> The patch concept is fairly simple.
>
>> 1. Add a new boolean local variable: require_max_align
>> (initialized to false).
>
> This really can't possibly work, because you'd need to propagate
> knowledge of the tuple's alignment requirement all over the place.
> In particular, how would code *reading* the tuple know where the
> data starts?

Uh, at t_hoff, no?

> Also, I don't think you get (very much of) the actual benefit unless the
> code that inserts tuples into disk pages knows to do something different in
> the int-align case.

+1

--
Gregory Stark
EnterpriseDB http://www.enterprisedb.com
Ask me about EnterpriseDB's PostGIS support!

In response to

Responses

Browse pgsql-hackers by date

  From Date Subject
Next Message Tom Lane 2008-09-02 15:39:29 Re: rmgr hooks and contrib/rmgr_hook
Previous Message Gregory Stark 2008-09-02 15:30:43 Re: Question regarding the database page layout.