[Hibernate-devel] performance (please read)

[Gavin_King/Cirrus%<CI...@ci...>]

I have just been doing some new performance tests. I am very pleased with
the results. Hibernate's performance is still very competitive with
handcoded JDBC in my test environment.

Well, with a single caveat (the point of this post):

The "atomic Session" feature is a total performance killer. I should have
realised this earlier but I was always performance testing using
hibernate.atomic_session=false. Atomic sessions allow the application to
continue using a session, even when some kind of exception is thrown from
the persistence layer. I can't think of a really good reason why
applications whould need this feature.

Atomic sessions are currently ENABLED BY DEFAULT. Everyone who wants to see
performance potentially double should DISABLE atomic sessions by setting
the system property (not a SessionFactory property):

hibernate.atomic_session=false

I will rip out this feature in the next version of hibernate, since the
performance cost is ridiculous for a feature of such debatable value.

Gavin