As part of our setup, we will run a WLST script that configures the domain-wide agent and then creates an SNMP Trap Destination on port 4000.WLDF was first released in WebLogic Server version 9.0, and in the releases since we then have been continuing to add value to its features in line with these themes.
If you are looking for more of a general introduction to WLDF, you can find a nice introduction to the WLDF feature set in this article by Rebecca Sly. Ora-12751: Cpu Time Or Run Time Policy Violation Code And ScriptsAt the end of this article you will find references to that and other articles, to other documentation of interest on WLDF, as well as links to all sample code and scripts used in this article. The Instrumentation subsystem is an implementation of an AOP (Aspect Oriented Programming) system that can be used to declaratively instrument server and application classes at the bytecode level with diagnostic code, or monitors in WLDF parlance. These monitors can be dynamically enabled or disabled, and can be configured with one or more actions to take when triggered. These actions are by design a closed set, and can range from simple trace events when a joinpoint is exercised, to tracing the elapsed time of execution around a joinpoint, to capturing method invocation statistics in memory. The Watch Notifications (WN) system consumes data generated by other parts of WLDF (MBean data through the Harvester, as well as data from Instrumentation andor Log events) and applies configured rules against that data. If a rule evaluates to true, WN can generate a notification over SNMP, SMTP, JMX, JMS, or any combination therein. It maintains the history of server and application performance. The WLDF Dashboard is a WLS Console extension Applet that provides the ability to build custom collections of charts to graph both WLS RuntimeMBean and WLDF Instrumentation data. You can use the the MedRec sample application that ships with the Oracle WebLogic Server distribution out-of-the-box, or use the ConfigurationWizard to create your own standalone MedRec domain. Both the out-of-the-box application and the MedRec Configuration Wizard template default settings include a sample WLDF configuration. Ora-12751: Cpu Time Or Run Time Policy Violation How To Configure YourFor details on how to configure your own MedRec domain, you can find documentation on the Configuration Wizard here, configuring a base domain here, and on extending a base domain here. If you choose to use the extension template and create your own MedRec domain, just accept all the default options when installing the MedRec application extension template to a base domain. Typically this would require hard-coded or third-party solutions to monitor the application response times. However, utilizing WLDF Instrumentation and the WN framework, we can automatically trigger a notification when a violation occurs, without extra programming. When the Watch rule triggers, it will transmit an SNMP notification to any listening trap monitors. This leverages the WLDF dye filtering capability, where instrumentation monitors can be configured to only fire when certain properties of a request match configured properties on the WLDF DyeInjection monitor. Therefore, for the purposes of our demonstration when invoking the MedRec application we will be using the localhost address to connect to the MedRec server with the browser. Set a watch on the Average CPU load using the JRockitRuntimeMBean. SNMP notification snmpnotif cmo.createSNMPNotification (demoSNMP). AND TYPE LIKE TraceElapsedTimeAction-After AND PAYLOAD 1000000). This Watch will examine generated instrumentation events and trigger when the payload value in the event from ServletAroundService monitor in the medrec application indicates a value above 1 ms.
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