Re: Aleksander Alekseev
> 1) Provide a tool written in C that allows changing pg_control, e.g.
> `pg_writecontoldata` or maybe a flat like `pg_controldata -w`.
I thought we already had pg_resetwal for that.
Christoph
Aleksander Alekseev writes:
> Hi,
>
> Previously it was pointed out [1] that manipulating the pg_control
> file from Cluster.pm may be beneficial under certain conditions.
[...]
> Unfortunately this can't be done at the moment. One of the reasons is
> that the ControlFileData structure stores pla
Hi,
> > It is my understanding that Perl is not extremely aware of alignment.
> > For instance if I want to modify the checksum of the file and the
> > offset of the checksum is let's say 200 bytes on one platform, 204 on
> > another and 208 on a third, pack/unpack will not help me.
> >
> > Or did
Aleksander Alekseev writes:
> Hi Dagfinn,
>
>> Notwitstanding Tom's objections, these are not reasons for not being
>> able to manipulate these values from Perl. The `i` and `I` formats for
>> pack/unpack (see https://perldoc.perl.org/functions/pack) use what the C
>> compiler calls `int`, in te
Re: Aleksander Alekseev
> Do you think pg_resetwall should be able to do more than it currently
> does, or merely pointing out that we already have a tool for editing
> pg_control file?
I don't know if being able to mess with these fields makes sense, but
if so, pg_resetwal seems like the correct
Hi Christoph,
> Re: Aleksander Alekseev
> > 1) Provide a tool written in C that allows changing pg_control, e.g.
> > `pg_writecontoldata` or maybe a flat like `pg_controldata -w`.
>
> I thought we already had pg_resetwal for that.
That's a good point.
In the case I referred to [1] however I want
Hi Dagfinn,
> Notwitstanding Tom's objections, these are not reasons for not being
> able to manipulate these values from Perl. The `i` and `I` formats for
> pack/unpack (see https://perldoc.perl.org/functions/pack) use what the C
> compiler calls `int`, in terms of both endianness and size.
>
>
Aleksander Alekseev writes:
> Previously it was pointed out [1] that manipulating the pg_control
> file from Cluster.pm may be beneficial under certain conditions.
> As an example, one can downgrade the catalog version in pg_control,
> place input files for pg_upgrade, execute pg_upgrade and chec
