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From Bertil Chapuis <bchap...@gmail.com>
Subject Re: History values
Date Wed, 14 Apr 2010 08:04:51 GMT
I'm also new to cassandra and about the same question I asked me if using
super columns with one key per version was feasible. Is there limitations to
this use case (or better practices)?

Thank you and best regards,

Bertil Chapuis

On 14 April 2010 09:45, Sylvain Lebresne <sylvain@yakaz.com> wrote:

> > I am new to using cassandra. In the documentation I have read,
> understand,
> > that as in other non-documentary databases, to update the value of a
> > key-value tuple, this new value is stored with a timestamp different but
> > without entirely losing the old value.
> > I wonder, as I can restore the historic values that have had a particular
> > field.
>
> You can't. Upon update, the old value is lost.
> From a technical standpoint, it is true that this old value is not
> deleted (from disk)
> right away, but it is deleted eventually by compaction (and you don't
> really control
> when the compactions occur).
>
> --
> Sylvain
>

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