Re: The Practical Benefits of the Relational Model
Date: 18 Oct 2002 10:17:03 +0200
Message-ID: <3dafc37f$1_at_news.uia.ac.be>
In article <aon0qq$1jak$1_at_sp15at20.hursley.ibm.com>,
Paul Vernon <paul.vernon_at_ukk.ibmm.comm> wrote:
>
>"Jan.Hidders" <hidders_at_hcoss.uia.ac.be> wrote in message
>news:3dadc2d1$1_at_news.uia.ac.be...
>> >The only things they provide that cannot be done using core model
>> >concepts, are things that explicitly do not want to be in the hands of
>> >users.
>>
>> What they provide is the illusion that you are the only one who is
>> allowed to use the database at the moment and everybody else has to wait.
>
>At the cost of other users having to wait.
No, the *illusion* that the other users have to wait. How much the other users really have to wait depends upon the locking protocol.
What!? Are you seriously suggesting that optimistic locking protocols cannot guarantee serializability?
- Jan Hidders