Re: Reliable and fast money transaction design

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Tom Lane wrote:
> "Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
>> Tom Lane wrote:
>>> "Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
>>>> SERIALIZABLE is really slow :).
>>> Say what? If anything it's probably faster than READ COMMITTED, because
>>> it doesn't take as many snapshots. But the difference is likely down in
>>> the noise anyway.
>
>> Not in production it isn't.
>
> Well, I can believe that specific applications might be slower overall
> due to having to retry transactions that get serialization failures,
> or perhaps because they take more locks to prevent such failures.
> But it's not slower as far as the database engine is concerned.

Well I can only speak to live production loads. I have never profiled
the difference from that low of a level. I can definitely say that in a
standard web app, under velocity, serializable is a huge performance killer.

Sincerely,

Joshua D. Drake

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