>
> https://www.postgresql.org/docs/9.5/static/wal-internals.html
>>
>
> "After a checkpoint has been made and the log flushed, the checkpoint's
> position is saved in the file pg_control. Therefore, at the start of
> recovery, the server first reads pg_control and then the checkpoint record;
> then it performs the REDO operation by scanning forward from the log
> position indicated in the checkpoint record. Because the entire content of
> data pages is saved in the log on the first page modification after a
> checkpoint (assuming full_page_writes is not disabled), all pages changed
> since the checkpoint will be restored to a consistent state."
>
>
>> Hi, yes I know that, it's what I meant in my point 3). As it says first
"the checkpoint's position (NOT the record)is saved in the file
pg_control" then I had some doubt.
Regards
Pupillo