HTTrace [7] is a capture-and-replay tool developed as part of the SIKOSA project. HTTrace was designed for carrying out blackbox database application regression tests efficiently. Figure 1 shows the design of HTTrace. HTTrace has two components. One component (Figure 1a) is a tool for test engineers to record test runs.During the recording phase, the application is expected to work correctly so that the answers returned by the application are correct.Furthermore the state of the test database D after a test run is recorded is expected to be correct, too. HTTrace records the requests and the answers of the application at the end of a test run. After the application code has changed (e.g., customization or a software upgrade), the test engineers can run the recorded test runs by invoking the playback component of HTTrace (Figure 1b) in order to find out how the changes have affected the behavior of the application. This kind of process is called regression testing. HTTrace re issues automatically the requests recorded in its repository to the application and compares the answers of the updated application with the answers stored in the repository.