Oracle Database Performance Tuning with AWR, ASH and ADDM

This book provides a practical guide to Oracle’s diagnostic triad: AWR, ASH, and ADDM. It teaches you how to read the reports produced by these tools and how to go beyond formatted reports by querying the underlying diagnostic views directly with SQL. This direct-query approach gives you incredible flexibility and enables targeted analysis with great precision. Built on decades of consulting experience, this book provides practical scripts and real-world cases that demonstrate a repeatable diagnostic workflow. Start with AWR to understand the overall performance landscape and identify symptoms. Use ASH to validate hypotheses and drill down to precise root causes at the session, SQL, or object level. Use ADDM as a supplementary source of guidance to support and refine the investigation. What You Will Learn Interpret the mechanics behind AWR snapshots, ASH sampling, and ADDM findings. Detect anomalies by focusing on a few key sections instead of reading the entire AWR report. Measure overall database health using AWR, ASH, and ADDM reports. Query raw ASH, AWR, and ADDM view data directly with SQL. Leverage AWR, ASH, and ADDM together to troubleshoot Oracle performance issues. Develop a reusable SQL toolkit for Oracle performance diagnostics. Who This Book Is For : Database administrators, consultants, and system architects who need practical, evidence-based Oracle performance diagnostics using ASH, AWR and ADDM, suitable for intermediate-to-advanced readers