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From Romain Manni-Bucau <rmannibu...@gmail.com>
Subject Re: Persistence units
Date Mon, 18 Mar 2013 15:20:15 GMT
Hi,

IMO the criteria are:
1) can it be different databases
2) is it developped by differents teams
3)  (a bit less relevant) does it make sense for the design

*Romain Manni-Bucau*
*Twitter: @rmannibucau <https://twitter.com/rmannibucau>*
*Blog: **http://rmannibucau.wordpress.com/*<http://rmannibucau.wordpress.com/>
*LinkedIn: **http://fr.linkedin.com/in/rmannibucau*
*Github: https://github.com/rmannibucau*



2013/3/18 Krishnaprasad Subbarao <krishnaprasads@in.ibm.com>

> Hello,
>
> I am working on a large application which has around 50 entities and many
> relational tables. We wish to use OpenJPA 2.1 as a Persistence provider.
>
> I would like to know what criteria's should be considered while deciding
> the number of persistence units to be defined in an application. Following
> are my questions about persistence units
>
> 1) What are points to be considered to decide how many persistence units
> should be created in an application?
>
> 2) Is it recommended to have one persistence unit per logical module
> (Business module) in an application?
>
> While exploring I found that multiple persistence units are created mostly
> if different entities are packaged in different WAR/JAR/EAR files. Is this
> the only criteria to have multiple units?
>
> Regards,
>
> Krishnaprasad (Kp)
>
>

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