Specifying the Initial Cache Size of the Persistence Manager 

       1.      Open the ejb-j2ee-engine.xml.

       2.      From the Enterprise Beans tab, choose entity beans → your container-managed entity bean.

       3.      In the Initial cache size field in the right-hand pane, specify the initial size of the Persistence Manager cache.

This deployment property can be specified for container-managed entity beans only.