Re: computational model of transactions

> "At time T4 the $100 transaction completes, recording a balance of
> $450." allright, but
> at time T5 the $75 transaction aborts with a 'cannot serilize message'
> likewise, at time T6 the $500 transaction also aborts with the same
> message.

versus

>> Since each of them wants to update the very same resource (the same
>> attribute of the same tuple of the same relvar), these transactions
>> should be serialized anyway.

> Not necessarily. Read any book on MVCC.

So to summarize :

If I claim those transactions should be serialized, then you say I'm wrong (well, the least you implied is that my statement was a bit short through the bend, if I read you correctly).

And regarding the given example itself, you then say, as I did, that those transactions cannot complete normally unless they are indeed serialized ?

Can you please explain, because I'm afraid I don't really understand. Received on Mon Aug 07 2006 - 08:48:48 CEST