Re: Possible mistake in Section 63.6 - 9.6devel Documentation

On Tue, Jul 21, 2015 at 9:59 AM, Michael Paquier
<michael(dot)paquier(at)gmail(dot)com> wrote:
> On Tue, Jul 21, 2015 at 6:54 AM, Vignesh Raghunathan
> <vignesh(dot)pgsql(at)gmail(dot)com> wrote:
>> Hello,
>>
>> It has been mentioned in Section 63.6 that the first two fields in
>> PageHeaderData track the most recent WAL entry related to the page. However,
>> I am not sure how pd_checksum is related to WAL. Could it be possible that
>> the sentence has been carried over from previous versions of the
>> documentations without considering the change to the second field in
>> PageHeaderData?
>
> Yes, the documentation is mistaken. The two bytes of pd_tli have been
> switched to pd_checksum in 9.3, hence only the first field is relevant
> for WAL, aka pd_lsn. Looking at this portion of the docs I think that
> it should be updated as attached, mentioning pd_checksum as well.

Also the type of pd_lsn in the Table 63-3 should be PageXLogRecPtr.

Regards,

--
Fujii Masao