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JPA 1.2 Overhead [message #654369]

Tue, 15 February 2011 08:26

Manuel Breu
Messages: 2
Registered: February 2011

Junior Member

Hi there!
I am doing a huge data import using jpa 1.2 and eclipselink and i have to estimate the required heap space.
is there any documentation or method of calculation of the overhead that is generated by jpa in comparison to pure jse classes?

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Re: JPA 1.2 Overhead [message #654597 is a reply to message #654369]

Wed, 16 February 2011 08:03

Michal Piotrowski
Messages: 6
Registered: February 2011

Junior Member

I would recommend you to write simple test (for example inserting 100000 rows) and monitor heap usage using jvisualvm (included in every recent JDK).

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Re: JPA 1.2 Overhead [message #654918 is a reply to message #654369]

Thu, 17 February 2011 10:46

James Sutherland
Messages: 1834
Registered: July 2009

Senior Member

Also ensure you disable caching for the import, enable batch writing if your database supports it, and ensure weaving is used.

Also don't do the whole insert in one transaction or one EntityManager, break it up into batches of say 1000.

Also consider the properties,

"eclipselink.persistence-context.persist-on-commit"="false "
"eclipselink.persistence-context.close-on-commit"="true"

If you are really adventurous you could also process multiple batches at the same time on multiple threads.

James : Wiki : Book : Blog

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