From: | "Joshua D(dot) Drake" <jd(at)commandprompt(dot)com> |
---|---|
To: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
Cc: | PgSQL General <pgsql-general(at)postgresql(dot)org> |
Subject: | Re: BEGIN WORK READ ONLY; |
Date: | 2006-10-14 19:09:01 |
Message-ID: | 453135CD.7090102@commandprompt.com |
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Thread: | |
Lists: | pgsql-general |
Tom Lane wrote:
> "Joshua D. Drake" <jd(at)commandprompt(dot)com> writes:
>> What is the use case for a READ ONLY transaction?
>
>> I haven't been able to come up with a good answer. Anyone got a use case
>> for this feature? I know the community didn't implement it for giggles.
>
> No, we implemented it because it's required by the SQL spec.
>
> I'm not too sure about use-cases either. It certainly seems pretty
> useless from a protection standpoint. It might be that some other
> DBMSes like to know about READ ONLY so they can optimize transaction
> processing, but Postgres doesn't care. (We do the equivalent optimization
> by noting at COMMIT time whether you actually made any DB changes,
> which we can determine basically for free by seeing if the xact emitted
> any WAL records ...)
Thank you, that's what I needed.
Sincerely,
Joshua D. Drake
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