For enterprise scale with 100+ terabytes of Apache logs (or any other logs) use a tool like SenSage (http://www.sensage.com http://www.sensage.com). It adds re

For enterprise scale with 100+ terabytes of Apache logs (or any other logs) use a tool like SenSage (http://www.sensage.com http://www.sensage.com). It adds real-time alerting and operational/security analysis of your entire server history.