IBM BJ0NJML Integration Guide - Page 182
WebLogic Server, Message Caching
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Continuous Queue WebLogic Server 2 Select intjmsact. 3 Specify a value in the Maximum Concurrent End Points field. By default, the WebLogic Server is configured to have three message-driven beans. Use the values shown in bold to configure the number of message-driven beans in the weblogic-ejb-jar.xml file: Start with a relatively low amount of message-driven beans, for example two to three message-driven beans. You then determine whether that amount provides proper support for the volume of messages in your system. You can incrementally increase the number of message-driven beans until you are satisfied with the processing performance of the messages in the continuous queue. The number of message-driven beans and the volume of messages processing in a queue can use enough system resources to affect your application users. If you continue to increase the amount of message-driven beans, this change may have little or no impact on message processing performance. You can resolve some system performance issues by clustering your servers and isolating the inbound message processing to a specific server cluster. Message Caching Continuous queue processing uses a property called Maximum Batch Size. The property is under the Activation Specification definition. The batch size controls the number of messages that the system receives from the messaging engine in a single batch. If three message-driven beans are enabled, and the batch size is 10, a maximum of 30 messages are cached. Test with different values to ensure that the value that you set does not impact application users or server processes. An unlimited number of messages can be processed when you set the Batch Size value to -1 on a WebLogic Server environment. If you plan to use a WebSphere Application Server error queue, use the default value for the batch size. 168 Integration Guide