Re: How to generate a WAL record spanning multiple WAL files?

Hi,

On Tue, Apr 5, 2022 at 9:46 PM Alvaro Herrera <alvherre(at)alvh(dot)no-ip(dot)org>
wrote:

> On 2022-Apr-05, Bharath Rupireddy wrote:
>
> > Hi,
> >
> > I wanted to have a WAL record spanning multiple WAL files of size, say
> > 16MB. I'm wondering if the Full Page Images (FPIs) of a TOAST table
> > would help here. Please let me know if there's any way to generate
> > such large WAL records.
>
> It's easier to use pg_logical_emit_message().
>
>
Not sure I understand the question correctly here. What if I use the below
code
where the len might be very large? like 64MB.

XLogBeginInsert();
XLogRegisterData((char *)&xl_append, sizeof(xl_cstore_append));
XLogRegisterData((char *)data, len);

XLogInsert(..);

--
Best Regards
Andy Fan