Are events logged at the data tier good places to find evidence related to application domain specific logic?

• A. True
• B. False
• C. Sometimes
• D. Only if the data tier is centralized

Answer: (B)

Domain-specific logic is best evidenced in the application layer, where business rules and workflows are implemented and logged. Logs at the data tier mainly record data storage operations and state changes in the database—what was changed, when, and by whom—not the reasoning behind those actions or the decisions dictated by domain rules. While a data-tier log might show that a row was updated or a specific trigger fired, it typically won’t capture the business context, user intent, or steps of a workflow that led to that change. Stored procedures or triggers can reveal some automated rules, but they still don’t provide the full domain-level rationale or user actions behind them. So, relying on data-tier events alone would give an incomplete picture of application-domain logic; better sources are application logs, API traces, and domain-event logs.