On Wed, Jun 7, 2017 at 12:49 PM, Andres Freund <andres@anarazel.de> wrote:
> On 2017-06-07 07:49:00 -0300, Alvaro Herrera wrote:
>> Instead of adding a second 64 bit counter for multixacts, how about
>> first implementing something like TED which gets rid of multixacts (and
>> freezing thereof) altogether?
>
> -1 - that seems like a too high barrier. We've punted on improvements on
> this because of CSN, xid-lsn ranges, and at some point we're going to
> have to make pragmatic choices, rather than strive for something more ideal.
What is the problem that we are trying to solve with this change? Is
there a practical use case for setting autovacuum_freeze_max_age >
2000000000, or is this just so that when autovacuum fails to vacuum
things in time, we can bloat clog instead of performing an emergency
shutdown?
--
Robert Haas
EnterpriseDB: http://www.enterprisedb.com
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