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Re: Performance JPA

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On 11/20/2015 3:41 AM, Cecil Westerhof wrote:
> I am at the end of my first JPA project. At the moment we are working
> with one entity manager in the application. I heard that it could be a
> good idea to use several entity managers, because that could improve
> the performance. Is this true, or just a myth?
>
>
> Also I was told that Hibernate is about three times as fast as
> openJPA. We are required to use openJPA because we are using the IBM
> Web Application Server. The performance with openJPA is about the same
> as when the application used JDBC. So then it looks not very
> reasonable to think that Hibernate will be three times as fast as
> openJPA. But I also understood that IBM WAS uses a highly optimised
> version of openJPA.
>
> Is it true that Hibernate is a lot faster, or is it a case of: lies,
> damned lies and statistics?

Damn lies.

:-)

For any persistence framework the majority of time should be spent
on database work and communication with the database.

If OpenJPA already send good SQL, then it can only be improved
marginally.

Furthermore JPA providers is a competitive area, so if one
provider got a brilliant idea, then the other would adopt it
immediately.

Arne

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Performance JPA Cecil Westerhof <Cecil@decebal.nl> - 2015-11-20 09:41 +0100
  Re: Performance JPA Arne Vajhøj <arne@vajhoej.dk> - 2015-11-20 19:24 -0500

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