Re: [Proposal] Fully WAL logged CREATE DATABASE - No Checkpoints

On Wed, Mar 23, 2022 at 9:05 PM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> On Wed, Mar 23, 2022 at 7:03 PM Robert Haas <robertmhaas@gmail.com> wrote:
> >
> > On Wed, Mar 23, 2022 at 9:19 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
> > > I think directly using smgrcreate() is a better idea instead of first
> > > registering and then unregistering it.   I have made that change in
> > > the attached patch.  After this change now we can merge creating the
> > > MAIN_FORKNUM also in the loop below where we are creating other
> > > fork[1] with one extra condition but I think current code is in more
> > > sync with the other code where we are doing the similar things so I
> > > have not merged it in the loop.  Please let me know if you think
> > > otherwise.
> >
> > Generally I think our practice is that we do the main fork
> > unconditionally (because it should always be there) and the others
> > only if they exist. I suggest that you make this consistent with that,
> > but you could do it like if (forkNum != MAIN_FORKNUM &&
> > !smgrexists(...)) continue if that seems nicer.
>
> Maybe we can do that.
>
> > Do you think that this version handles pending syncs correctly? I
> > think perhaps that is overlooked.
>
> Yeah I missed that.  So options are either we go to the other approach
> and call RelationPreserveStorage() after
> RelationCreateStorage(),

Here is the patch with this approach, I am not sending both patches
with different approaches in the same mail otherwise cfbot might
generate conflict while applying the patch I think, so I will send it
in a seperate mail.

-- 
Regards,
Dilip Kumar
EnterpriseDB: http://www.enterprisedb.com