TrueLog On Error files provide complete histories of the transactions that precede errors uncovered during load tests. They enable you to drill-down through real content to analyze error conditions.
TrueLog On Error files maintain histories of all client requests and server responses. Because they present errors in the context of the sessions within which they occur and are closely integrated with test scripts, TrueLog On Error files are uniquely suited for root-cause analysis of system and application faults.
Because TrueLog On Error is recorded only when errors are encountered, it is much less of a drain on memory and processing than is standard TrueLog.
It is typical after running a test to have multiple TrueLog On Error files open in TrueLog Explorer (one TrueLog for each virtual user who returns an error). With the TrueLog Explorer Find Errors feature, errors can be identified chronologically, regardless of which TrueLogs the errors were recorded in. This simplifies the process of analyzing errors. There is no need to manually review all open TrueLogs to find the next error in a sequence.