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From Craig L Russell <Craig.Russ...@Sun.COM>
Subject Re: NonTransactionalRead & Query Fetchplan
Date Wed, 08 Oct 2008 20:19:46 GMT
Hi Christiaan,

On Oct 8, 2008, at 2:33 AM, Christiaan wrote:

>
> Hi,
> I have a question about the behaviour of Queries after a commit when
> "NonTransactionalRead" is set to true. Should a Query behave like it  
> did
> before the commit? More specifically, when defining a fetchsize in the
> FetchPlan I would like to see that the Query is still honouring this
> fetchsize after a commit is given. If I am not mistaken, this is not
> explicitly described in the specification?

Correct. The behavior of a Query when the Transaction associated with  
the PersistenceManager is closed is undefined.
>
>
> The scenario I am working with is as such:
> I have set NonTransactionRead=true and Multithreaded=true. I have 1  
> pm, and
> 2 threads. Thread 1 performs reads (executing queries with large  
> result set)
> and Thread 2 performs writes. Now when I am iterating over a large  
> query in
> Thread 1 and Thread 2 is doing a commit, I don't want this to affect  
> the
> iterating over the query in Thread 1.

I'd be open to putting the behavior into the specification. Can you  
propose a patch to the specification?

Craig
>
>
> kind regards,
> Christiaan
>
>
> -- 
> View this message in context: http://www.nabble.com/NonTransactionalRead---Query-Fetchplan-tp19875446p19875446.html
> Sent from the JDO - Development mailing list archive at Nabble.com.
>

Craig L Russell
Architect, Sun Java Enterprise System http://db.apache.org/jdo
408 276-5638 mailto:Craig.Russell@sun.com
P.S. A good JDO? O, Gasp!


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