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25.4 Summary

You should now be familiar with the following concepts:

  • How to create an appropriate test. Specifically, it should be a scale model of the production environment.

  • Which test types should be run to minimize the risk of encountering a problem in the production environment. These test types are correctness tests, performance tests, stress tests, and endurance tests.

  • How to generate realistic test scenarios and proper workload mixes. These should be derived from real-world users.

  • How to enact proper change control by restricting administrative privileges, logging administrative accesses, regularly creating backups of your configuration, keeping a log history, and documenting procedures.

  • When locating an error in a complex environment, it is useful to diagram the path of the request, beginning with the client all the way to the back-end.

  • Once an error has been located, first assume that the error is valid until it can be verified that it happened under erroneous circumstances.

  • When an error occurs, try to determine what, if anything, might have changed in the environment that could have contributed to the condition which promoted the error.

  • Try to re-create the error with the simplest test scenario, the simplest application, and the simplest environment.

  • WebSphere interim fixes and fix packs.

  • What resources are available for WebSphere support.

  • Working with IBM WebSphere support to resolve a WebSphere problem.

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