PCI DSS doesn’t forgive weak audit trails. It demands a full record: who did what, when, and how. Audit logs are not an extra—they are the backbone of proof. Without them, passing an audit is guesswork.
To meet PCI DSS requirements for audit logs, every event that touches cardholder data must be captured. Access attempts. Privilege changes. File reads and writes. System configuration edits. Database queries. Successes and failures. The standard requires more than “it happened”—it needs timestamps, user IDs, origin IPs, and the exact action taken. This isn’t optional.
Retention rules are strict. PCI DSS requires audit logs to be stored at least a year, with the last three months immediately available. That means secure storage, fast retrieval, tamper resistance. A flat file in a forgotten VM won’t cut it. Logs must be protected against alteration and deletion. Clock sync across systems is non‑negotiable—every timestamp must align.
Real‑time monitoring is just as critical. PCI DSS expects you to review logs regularly, detect anomalies, and respond. Static logs checked once a year are useless when attackers strike today. Alerts must fire for suspicious activity, from failed login bursts to unexpected privilege escalations.