Re: views of binary operations
From: paul c <toledobythesea_at_oohay.ac>
Date: Tue, 18 Jul 2006 01:16:16 GMT
Message-ID: <ADWug.206374$IK3.62961_at_pd7tw1no>
>>
>> Data independence comprises two distinct types of independence.
>> Physical independence allows one to adjust performance characteristics
>> without disturbing a given logical design. Logical independence allows
>> one to adjust the logical design without disturbing existing
>> applications. One achieves the latter form of data independence
>> through application views -- especially updatable views.
>>...
> Thanks, that second paragraph seems to explain the distinction rather > well. ...
Date: Tue, 18 Jul 2006 01:16:16 GMT
Message-ID: <ADWug.206374$IK3.62961_at_pd7tw1no>
paul c wrote:
> Bob Badour wrote: > ...
>>
>> Data independence comprises two distinct types of independence.
>> Physical independence allows one to adjust performance characteristics
>> without disturbing a given logical design. Logical independence allows
>> one to adjust the logical design without disturbing existing
>> applications. One achieves the latter form of data independence
>> through application views -- especially updatable views.
>>...
> Thanks, that second paragraph seems to explain the distinction rather > well. ...
Oops, it was the first paragraph that I liked (the one above).
p Received on Tue Jul 18 2006 - 03:16:16 CEST