>From: Martijn Tonies [mailto:m.tonies@stripped]
>Sent: Friday, February 13, 2009 4:40 PM
>Subject: Re: Codd's rule 8 (physical data idependence)
>>>>*Applications should not be logicaly impaired when the physical
>>>>access ethods change.*
>>>Changing the storage engine for tables, for example from a
>>>to non-transactional engine, changes the database logic.
>> [JS] Is that really an example of Codd's rule #8? It is a higher-level
>> change than simply going from a hard drive to a RAM drive to magnetic
>> any of which could conceivably be used with any of the storage
>I think you're right, but a "non transactional storage engine" fails on
>a higher rule: namely the atomicy rule.
>A non transactional engine is of near no use.
[JS] That's why I like magnetic tape, it's so easy to rewind. :<)