Re: Predefined role pg_maintenance for VACUUM, ANALYZE, CHECKPOINT.

On 10/30/21, 11:14 AM, "Jeff Davis" <pgsql@j-davis.com> wrote:
> On Sat, 2021-10-30 at 13:24 +0530, Bharath Rupireddy wrote:
>> IMHO, moving away from SQL command "CHECKPOINT" to function
>> "pg_checkpoint()" isn't nice as the SQL command has been there for a
>> long time and all the applications or services that were/are being
>> built around the postgres ecosystem would have to adapt someday to
>> the
>> new function (if at all we deprecate the command and onboard the
>> function). This isn't good at all given the CHECKPOINT is one of the
>> mostly used commands in the apps or services layer. Moreover, if we
>> go
>> with the function pg_checkpoint(), we might see patches coming in for
>> pg_vacuum(), pg_reindex(), pg_cluster() and so on.
>
> I tend to agree with all of this. The CHECKPOINT command is already
> there and people already use it. If we are already chipping away at the
> need for superuser elsewhere, we should offer a way to use CHECKPOINT
> without being superuser.

I think Bharath brings up some good points.  The simple fact is that
CHECKPOINT has been around for a while, and creating functions for
maintenance tasks would add just as much or more clutter than adding a
predefined role for each one.  I do wonder what we would've done if
CHECKPOINT didn't already exist.  Based on the goal of this thread, I
get the feeling that we might've seriously considered introducing it
as a function so that you can just GRANT EXECUTE as needed.  

Nathan