Thats a cool idea, of course the cost to compute it might be a bit but could
be much less data to hang onto if the rows are large.
Cheers
-----Original Message-----
From: Zetie, Carl [mailto:[EMAIL PROTECTED]]
Sent: Friday, June 29, 2001 11:50 AM
To: [EMAIL PROTECTED]
Subject: Re: To scale or to be correct: that is the question
In some circumstances you can also make do with checksums on the data to be
committed. Not *guaranteed* to be correct, but for certain situations
appropriate.
>
> -----Original Message-----
> From: Evan Ireland [mailto:[EMAIL PROTECTED]]
> Sent: Thursday, June 28, 2001 9:40 PM
> To: [EMAIL PROTECTED]
> Subject: Re: To scale or to be correct: that is the question
>
>
> James Cook wrote:
> >
> > ... I don't think verified updates works in all concurrency
> situations,
> > but it will handle most of them.
>
> One case where it falls down is where some of the columns
> don't allow easy
> tests for equality in the WHERE clause (e.g. some BLOB and
> similar column
> types).
> Timestamps or version numbers are often more useful (and faster).
> ______________________________________________________________
> ______________
> ____
>
> Evan Ireland Sybase EAServer Engineering
> [EMAIL PROTECTED]
> Wellington, New Zealand
> +64 4
> 934-5856
>
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