From: pgsql-hackers-owner(at)postgresql(dot)org
> [mailto:pgsql-hackers-owner(at)postgresql(dot)org] On Behalf Of Amit Kapila
> It looks like the code in 9.3 or later version uses the recptr as the target
> segment location
> (targetSegmentPtr) whereas 9.2 uses recptr as beginning of segment (readOff
> = 0;). If above understanding is right then it will set different values
> for latestPagePtr in 9.2 and 9.3 onwards code.
>
In 9.2, the relevant variable is not recptr but recaddr. recaddr in 9.2 and recptr in later releases point to the beginning of a page just read, which is not always the beginning of the segment (targetSegmentPtr).
Regards
Takayuki Tsunakawa