On 29/12/15 07:14, Joe Conway wrote:
I wonder why "Latest checkpoint's NextXID" is formated like this:

8<-------------------------
        printf(_("Latest checkpoint's NextXID:          %u/%u\n"),
                   ControlFile.checkPointCopy.nextXidEpoch,
                   ControlFile.checkPointCopy.nextXid);
8<-------------------------

Shouldn't it use "%X/%X", same as e.g. "Prior checkpoint location" and
all the other XIDs?

No. The "locations" in the output are WAL locations. Those are customarily printed with %X/%X. But NextXID is a transaction ID, those are printed in decimal, with %u.

- Heikki



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