Re: Redesigning checkpoint_segments

On 06/05/2013 05:37 PM, Robert Haas wrote:
>
> On Wed, Jun 5, 2013 at 3:24 PM, Fujii Masao <masao.fujii@gmail.com> wrote:
>> OTOH, if we use max_wal_size as a hard limit, we can avoid such PANIC
>> error and long down time. Of course, in this case, once max_wal_size is
>> reached, we cannot complete any query writing WAL until the checkpoint
>> has completed and removed old WAL files. During that time, the database
>> service looks like down from a client, but its down time is shorter than the
>> PANIC error case. So I'm thinking that some users might want the hard
>> limit of pg_xlog size.
>
> I wonder if we could tie this in with the recent proposal from the
> Heroku guys to have a way to slow down WAL writing.  Maybe we have
> several limits:

I didn't see that proposal, link? Because the idea of slowing down 
wal-writing sounds insane.

JD



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