Bruce Momjian <pgman@candle.pha.pa.us> writes:
> It only becomes better if we can throw away that file (or contents) when
> the transaction completes and we have marked all the subtransactions as
> completed. We can't compress pg_clog if we store the parent info in
> there.
But we already have a recycling mechanism for pg_clog. AFAICS,
creating a parallel log file with a separate recycling mechanism is
a study in wasted effort.
regards, tom lane