Re: WIP: Avoid creation of the free space map for small tables

On Thu, Dec 13, 2018 at 3:18 AM John Naylor <jcnaylor(at)gmail(dot)com> wrote:
>
> On 11/24/18, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com> wrote:
> > 4. You have mentioned above that "system catalogs created during
> > bootstrap still have a FSM if they have any data." and I can also see
> > this behavior, have you investigated this point further?
>
> I found the cause of this. There is some special-case code in md.c to
> create any file if it's opened in bootstrap mode. I removed this and a
> similar special case (attached), and make check still passes. After
> digging through the history, I'm guessing this has been useless code
> since about 2001, when certain special catalogs were removed.
>

Good finding, but I think it is better to discuss this part
separately. I have started a new thread for this issue [1].

[1] - https://www.postgresql.org/message-id/CAA4eK1KsET6sotf%2BrzOTQfb83pzVEzVhbQi1nxGFYVstVWXUGw%40mail.gmail.com

--
With Regards,
Amit Kapila.
EnterpriseDB: http://www.enterprisedb.com