General trace and log analysis patterns allow the application of uniform diagnostics and anomaly detection across diverse software environments. It includes troubleshooting, debugging, describing, and explaining problems and incidents on various operating systems and platforms. It is also helpful in recording network traces, malware, general data, narratives, and text and image analysis (space-like narratology). This course, organized as a pattern language dictionary and cross-referenced with classification, explains and teaches more than 200 traces and log analysis patterns.

A Guide to Learning Software Trace and Log Analysis Patterns

## Event sequence order
In any system, the **event sequence order** pattern is expected as a precondition to its normal behavior. Any out-of-order events should raise the suspicion bar as they might result in or lead to synchronization problems. It needs to be a sequence of trace messages not only from different threads but also between processes. For example, image load events in CDF / ETW traces can indicate the wrong configuration of a service startup order. The following diagram depicts a possible pattern scenario:

# Event sequence order
In any system, the **event sequence order** pattern is expected as a precondition to its normal behavior. Any out-of-order events should raise the suspicion bar as they might result in or lead to synchronization problems. It needs to be a sequence of trace messages not only from different threads but also between processes. For example, image load events in CDF / ETW traces can indicate the wrong configuration of a service startup order. The following diagram depicts a possible pattern scenario:

This lesson introduces the following analysis patterns: event sequence order, event sequence phase, explanation trace, factor group, focus of tracing, and Fourier activity.

Getting Started

Activity

Block and Data

Error and Large Scale

Message 1

Message 2

Trace as a Whole

Trace Set

Vocabulary, Memory, Code and Text

Conclusion

Index

Order, Phase, Explanation, Factor, Focus, Fourier

Event sequence order