Bruce Momjian <pgman@candle.pha.pa.us> writes:
> Do we want UNDO just for subtransactions?
> That was pretty easily defeated, though I made an argument that you
> could do UNDO pretty cheaply when you have WAL ensuring crash recovery.
That argument was what got us into the early-7.1 WAL bloat problems.
I don't think it's "pretty cheap" to have to hold the entire WAL for the
length of your longest-running transactions.
regards, tom lane
