Re: Sequence's value can be rollback after a crashed recovery.

Поиск
Список
Период
Сортировка
От Jeremy Schneider
Тема Re: Sequence's value can be rollback after a crashed recovery.
Дата
Msg-id 68420495-2580-efc6-e930-5f14c55caae9@ardentperf.com
обсуждение исходный текст
Ответ на Re: Sequence's value can be rollback after a crashed recovery.  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Sequence's value can be rollback after a crashed recovery.  (Tomas Vondra <tomas.vondra@enterprisedb.com>)
Список pgsql-hackers
On 11/22/21 12:31, Tom Lane wrote:
> "Bossart, Nathan" <bossartn@amazon.com> writes:
>> I periodically hear rumblings about this behavior as well.  At the
>> very least, it certainly ought to be documented if it isn't yet.  I
>> wouldn't mind trying my hand at that.  Perhaps we could also add a new
>> configuration parameter if users really want to take the performance
>> hit.
> 
> A sequence's cache length is already configurable, no?
> 

Cache length isn't related to the problem here.

The problem is that PostgreSQL sequences are entirely unsafe to use from
a durability perspective, unless there's DML in the same transaction.

Users might normally think that "commit" makes things durable.
Unfortunately, IIUC, that's not true for sequences in PostgreSQL.

-Jeremy


PS. my bad on the documentation thing... I just noticed that I said a
year ago I'd take a swing at a doc update, and I never did that!!
Between Nate and I we'll get something proposed.


-- 
http://about.me/jeremy_schneider



В списке pgsql-hackers по дате отправления:

Предыдущее
От: Tom Lane
Дата:
Сообщение: Re: Sequence's value can be rollback after a crashed recovery.
Следующее
От: Andres Freund
Дата:
Сообщение: Reduce function call costs on ELF platforms