Horton

Re: CHECKPOINT unlogged data

Dilip Kumar <dilipbalaut@gmail.com>

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From: Dilip Kumar <dilipbalaut@gmail.com>
To: Fujii Masao <masao.fujii@oss.nttdata.com>
Cc: Nathan Bossart <nathandbossart@gmail.com>, Christoph Berg <myon@debian.org>, Laurenz Albe <laurenz.albe@cybertec.at>, Andres Freund <andres@anarazel.de>, PostgreSQL Hackers <pgsql-hackers@lists.postgresql.org>
Date: 2025-07-10T05:18:45Z
Lists: pgsql-hackers

Commits

Same data as JSON: GET /api/v1/messages/:b64id/commits the thread's linked commits as JSON, with link sources. API reference →

  1. Add FLUSH_UNLOGGED option to CHECKPOINT command.

  2. Add MODE option to CHECKPOINT command.

  3. Add option list to CHECKPOINT command.

  4. Rename CHECKPOINT_FLUSH_ALL to CHECKPOINT_FLUSH_UNLOGGED.

  5. Rename CHECKPOINT_IMMEDIATE to CHECKPOINT_FAST.

Attachments

On Thu, Jul 10, 2025 at 10:34 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
>
> On Thu, Jul 10, 2025 at 9:55 AM Dilip Kumar <dilipbalaut@gmail.com> wrote:
> >
> > On Thu, Jul 10, 2025 at 9:31 AM Fujii Masao <masao.fujii@oss.nttdata.com> wrote:
> > >
> > >
> > >
> > > On 2025/07/10 4:26, Nathan Bossart wrote:
> > > > Here is what I have staged for commit, which I'm planning to do on Friday.
> > >
> > > Thanks for updating the patches!
> > >
> > > Regarding the 0005 patch:
> > >
> > > -                       COMPLETE_WITH("MODE");
> > > +                       COMPLETE_WITH("MODE, FLUSH_UNLOGGED");
> > >
> > > Shouldn't that be:
> > >
> > >      COMPLETE_WITH("MODE", "FLUSH_UNLOGGED");
> > >
> > > IOW, the two options should be separate strings, so it needs
> > > double quotes around each.
> >
> > I agree that it makes more sense to treat them as 2 separate strings.
>
> I was just playing around with the wrong mode seems error code is not
> correct, see below example
>
> postgres[906701]=# CHECKPOINT ( MODE wrong);
>
> 2025-07-10 05:00:41.644 UTC [906701] ERROR:  unrecognized MODE option
> "mode" at character 14
>
> 2025-07-10 05:00:41.644 UTC [906701] STATEMENT:  CHECKPOINT ( MODE wrong);
>
> ERROR:  42601: unrecognized MODE option "mode"
>
> LINE 1: CHECKPOINT ( MODE wrong);
>
> IMHO the error should be "unrecognized MODE option "wrong" not the "mode" ?
>
> While looking at the code it seems problem is here instead if
> 'opt->defname' we should use 'mode' variable.
>
> + else if (strcmp(mode, "fast") != 0)
> + ereport(ERROR,
> + (errcode(ERRCODE_SYNTAX_ERROR),
> + errmsg("unrecognized MODE option \"%s\"", opt->defname),
> + parser_errposition(pstate, opt->location)));

Attached fixup patch, fixes this issue as well as there is wrong
suggestion in tab completion, currently it suggest "CHECKPOINT (MODE,
FLUSH_UNLOGGED )" which is wrong, so this would be fixed what Fuji
suggested upthread to make them a 2 separate stings.

-- 
Regards,
Dilip Kumar
Google