Re: [Firebird-devel] Max transaction duration

[David J. <dav...@di...>]

On 2002.12.13 10:47:47 -0500 Ann W. Harrison wrote:
> At 05:57 PM 12/12/2002 -0500, David Jencks wrote:
> 
> >Please explain how the abandoned work on the resource manager will get
> >cleaned up automatically in this case unless the rm can unilaterally
> >discard it based only on information it knows.
> 
> I've probably got this all wrong, but if the tm tells a client
> connection that it's dead, one assumes that the client will
> disconnect, then Firebird will detect that the connection is
> gone and release all its resources.
> 
> 
Schemes like this put the responsibility for cleaning up failures on the
client.  As Nickolay points out, this leaves lots of opportunity for
malicious clients.  Even with friendly clients, I don't think it is
possible to provide the same level of reliability as a server-controlled
timeout  cleanup.  What if everything on a client except the tcp connection
gets locked up?

The dead connection detection in the server operates I think on this same
principle.  However, I'm not convinced that it alone provides sufficient
reliability.

thanks
david jencks

> 
> Regards,
> 
> Ann
> www.ibphoenix.com
> We have answers.
> 
> 
> 
> 
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