Re: MV counterexample

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"Anthony W. Youngman" <wol_at_thewolery.demon.co.uk> wrote in message news:JgK1THB4VrmAFwZq_at_thewolery.demon.co.uk...
> In message <4099fc71_at_post.usenet.com>, x <x-false_at_yahoo.com> writes
> >**** Post for FREE via your newsreader at post.usenet.com ****
> >
> >
> >"Karel Miklav" <karel_at_inetis.spppambait.com> wrote in message
> >news:c7cmao02o3q_at_enews4.newsguy.com...
> >> my point was, there is no inherent structure in data. We treat
> >> characters in a string and numbers in an array like they are somehow
> >> connected by invisible ties which preserve their order/structure, but
> >> they're not, they're only conencted in our haeds. There are reasons to
> >> optimize, but the structure is not one of them, rather a way.
> >
> >So you say that each "atomic" piece of data is (should be) self contained
?
> >Is this possible ? Wouldn't we end up with one big chunk of data ?
> >Or do you argue that all integrity constraints should belong to user
space
> >(in the user schema or in the user application) ?
> >
> define "atomic" :-)

"Atomic" data

• 1 bit of data.
• the smallest piece of data that someone is interested to work with

> define "user space" (as in schema or application :-)
I did. User schema or user application, or user head :-) User as in user of a database.

> Bearing in mind that apparently, in order to have real data integrity,
> we need user-defined primary data types, how on earth is that going to
> be PRACTICAL without pushing at least some integrity checks into
> user-space.

> A database relies on metadata to do integrity checks. Certainly with
> current RDBMSs, a major function of analysis is to convert metadata into
> data. Without some way of converting that data back into metadata (ie
> giving the user the ability to modify the operation of the database
> engine) there is no way the dbms is going to be able to apply any
> integrity check that relies on that sort of (meta)data.

I don't understand this.
Could you be more specific ?

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