From: Simon Riggs <simon@2ndquadrant.com>
> From xlogdefs.h added by 9155580:
> /*
> * First LSN to use for "fake" LSNs.
> *
> * Values smaller than this can be used for special per-AM purposes.
> */
> #define FirstNormalUnloggedLSN ((XLogRecPtr) 1000)
Yeah, I had seen it, but I didn't understand what kind of usage is assumed.
> I wonder why is that value 1000, rather than an aligned value or a whole WAL
> page?
I think that's because this fake LSN is not associated with the physical position of WAL records.
Regards
Takayuki Tsunakawa