Last updated on October 23rd, 2026 at 12:44 pm
user activity and technical failures are both called “logs,” but they serve different purposes. Keeping them separate makes each one easier to search, protect, and maintain.
Why it happens
An audit log answers business questions such as who changed a record, what changed, and when it happened. A technical log helps developers diagnose exceptions, failed jobs, slow requests, and service outages.
Putting both into one database table looks simple at first. Over time, noisy technical messages can make important business history harder to find and can add unnecessary load to the main application database.
A practical split
- Store audit events in the database. Use structured columns for the actor, action, affected record, tenant or organization, and timestamp.
- Keep technical logs in the normal logging system. Send errors, warnings, stack traces, and debugging details to files or a dedicated log service.
- Add searchable context. Include a request identifier and relevant record identifiers so related events can be traced without storing sensitive values.
-
Set different retention rules. Audit history may need long retention, while verbose debug logs can usually expire sooner.
Example
A status change belongs in an audit log:
actor_id: 42
action: status_changed
subject_type: order
subject_id: 781
old_status: pending
new_status: approvedA database timeout belongs in the technical log, with a request identifier that connects it to the affected operation.
Common mistakes
- Cause: every debug message is stored in the main database. Fix: reserve database storage for durable business events.
-
Cause: audit details exist only inside an unindexed JSON field. Fix: give frequently filtered values dedicated indexed columns.
-
Cause: logs contain passwords, tokens, or full personal data. Fix: redact sensitive values before writing any log.
-
Cause: there is no retention policy. Fix: define how long each log type must remain available.
Make audit events survive real failures
Record an audit event only when its business change commits. If events leave the database through a queue, an outbox written in the same transaction can prevent gaps between saving the change and dispatching the event. Restrict audit-log access and track corrections explicitly rather than silently rewriting history.
Audit logs preserve accountability; technical logs support troubleshooting. The concrete next action is to classify existing log events into those two groups before choosing storage or tools.