Re: 答复: [PERFORM] Postgresql update op is very very slow

"jay" <jackem.mojx@alibaba-inc.com> writes:
>     I know the problem, because there are about 35 million rows , which
> cost about 12G disk space and checkpoint segments use 64, but update
> operation is in one transaction which lead fast fill up the checkpoint
> segments and lead do checkpoints frequently, but checkpoints will cost lots
> resources, so update operation become slowly and slowly and bgwrite won't
> write because it's not commit yet.
> Create a new table maybe a quick solution, but it's not appropriated in some
> cases.
>     If we can do commit very 1000 row per round, it may resolve the
> problem.

No, that's utterly unrelated.  Transaction boundaries have nothing to do
with checkpoints.

            regards, tom lane