Re: XID wraparound and busy databases

Heikki Linnakangas írta:
> Zoltan Boszormenyi wrote:
>
>> Tom Lane írta:
>>
>>> It's hard to see how anyone could be doing 6K xacts/sec unless most are
>>> read-only.
>>>
>> In a recent stress test with our PostgreSQL-based cluster between two
>> machines
>> 3 million transaction were performed with "pgbench -c 150 -t 20000 -s 200"
>> in about _ten hours_. The primary machine (desktop-level machine for
>> development)
>> used a real disk, the secondary used tmpfs as PGDATA. Say whatever you want
>> about my disk lying about flush, its 75MB/sec transfer rate transfer
>> rate is real.
>> So 5 million "real" transaction in 24 hours is not unrealistic.
>>
>
> 6k xacts / s is five *hundred* million transactions, not five million...
>

Blush. :-) You're right. However a single machine with ramdisk is able
to do that.

--
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Zoltán Böszörményi
Cybertec Geschwinde & Schönig GmbH
http://www.postgresql.at/