Robert Haas <robertmhaas(at)gmail(dot)com> writes:
> An obvious problem is that, if the abort rate is significantly
> different from zero, and especially if the aborts are randomly mixed
> in with commits rather than clustered together in small portions of
> the XID space, the CLOG rollup data would become useless.
Yeah, I'm afraid that with N large enough to provide useful
acceleration, the cases where you'd actually get a win would be too thin
on the ground to make it worth the trouble.
regards, tom lane