The size of your Enterprise JavaBeans™ (EJB) cache can effect the performance of the application server. One of the steps in tuning your EJB container to optimum performance levels is to fine tune the EJB cache.
From your analysis, it is possible to set the EJB cache optimally from an EJB Container perspective, but perhaps not optimally from a WebSphere® Application Server perspective. A larger cache size provides more hits and better EJB cache performance, but uses more memory. Memory used by the cache is not available to other areas of the product, potentially causing the overall performance to suffer. In a system with ample memory, this might not be an issue and properly tuning the EJB cache might increase overall performance. However, you should take into account this system performance versus EJB cache performance when configuring the cache.
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