I am writing a framework for a rewrite of an existing application. We
have a data model of around 900 tables with 11000 fields in total and
databases approaching 120 GB in the field. The basic elements of my
new implementation are WPF, NHibernate 3, C#, .NET 4.0,
NHibernate.Validator and Spring. The application itself is very data/
transaction intensive and our largest installation has around 300
concurrent users.

A few things I would like feedback about are:

* Is Spring a good choice? Why should I choose a different one
(Castle?). I do have problems with startup time, but I have been able
to bring this back to around 14 seconds. I didn’t notice much
difference between Spring and Castle though. Shorter startup times are
of course welcome;

* I am using Identity fields, but understand this isn't the best
option. What viable alternative is there (HiLo does not sound like a
good idea);

* Data display is done with short sessions, one per query. Data entry
on the other hand has one session/transaction for the entire duration
of a workflow, which can take up to 10-20 minutes max (2-4 minutes is
more usual). Are there alternatives to a session/transaction for this
entire duration and how could I set this up?

I am open to all and every input and would like to integrate ideas
from people whom have been working longer, and have more experience,
with NHibernate than I have :).

(B.t.w.: I know I’m in way over my head, but that’s the way I prefer
it.)

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