WEBSPHERE MESSAGE BROKER ADMINISTRATION GUIDE PDF

These Nodes can be wired into your flow to provide logging at key points in the flow. When you add a trace node to your message flow you can choose what you want to log in the "Pattern" box. This box accepts any valid correlation name see: Correlation Names You can also choose whether you want to log to the Local Error Log, a file or User Trace. Note that when using the Local Error Log, on unix platforms, the length of the output is limited to a single syslog line. Another advantage of trace nodes is that they can be dynamically turned off and on at runtime without restarted the Broker. This means that you can build your flows with Trace Nodes but disable them in production so that there is no performance cost associated with the Node.

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These Nodes can be wired into your flow to provide logging at key points in the flow. When you add a trace node to your message flow you can choose what you want to log in the "Pattern" box. This box accepts any valid correlation name see: Correlation Names You can also choose whether you want to log to the Local Error Log, a file or User Trace.

Note that when using the Local Error Log, on unix platforms, the length of the output is limited to a single syslog line. Another advantage of trace nodes is that they can be dynamically turned off and on at runtime without restarted the Broker. This means that you can build your flows with Trace Nodes but disable them in production so that there is no performance cost associated with the Node.

If you experience a problem you can then choose to enable the Trace Nodes to perform problem diagnosis activity. From UserTrace you can tell exactly what path execution has taken through a message flow and what lines of ESQL have been executed. This makes it ideal for diagnosing problems where a message flow has not behaved as expected.

User Trace does have some performance impact so it is recommended that users minimize the length of time that UserTrace is on. This also has the advantage of producing less trace information to analyze. User Trace can be enabled using the following procedure: Turn on UserTrace for the entire execution group using the following command, here the "-r" parameter specifies that you want to clear out any previously existing trace entries before turning trace on and the -c parameter indicates that 2Gb will be allowed for binary log files.

Under normal circumstances you should not need to use service trace, however if you suspect you have found a bug or have been directed to take a service trace by IBM Support you can use this information to maximize your chances of capturing the correct information. This can save needing to recapture traces, because analysis has shown that the content that IBM Support are looking for is not present. There are six different approaches to capturing trace; please read the summary information and then select the most appropriate trace method.

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If a zone will be used, create the whole root zone. If a zone is being used, ensure the zone is booted. Repeat this step on all nodes of the cluster if a zone is being used. Boot the zone if it is not running. The WebSphere Message Broker files can be deployed onto a cluster file system or highly available file system in the cluster. The following discussion will help you determine the correct approach to take. Within this section, a single instance or multiple instances of WebSphere Message Broker will be considered within a global zone or zone.

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WebSphere Message Broker Basics

Application developers work in separate instances of the WebSphere Message Broker Toolkit to develop resources associated with message flows. The WebSphere Message Broker Toolkit connects to one or more brokers to which the message flows are deployed. You can only view and interact with brokers that you have created in WebSphere Message Broker Version 8. A perspective is a collection of views and editors that you use to complete a specific task, or work with specific types of resource. The two significant perspectives in the WebSphere Message Broker Toolkit are the Broker Application Development perspective for application development, and the Debug perspective for debugging message flows.

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