Performance

This article is a practical tuning script library. Each script targets a specific, common real-world performance scenario — not abstract examples, but the situations that actually appear at 2am during an incident. Scripts are annotated with where they run, what the output means, and what action to take. Reference Environment Single Instance: Host: ora19c01.prod.example.com DB Name: ORCL19C Oracle: 19.22.0.0 (Oracle Linux 8) Memory: 256 GB RAM, 32 vCPU Storage: Local NVMe (non-Exadata) CDB Environment: Host: cdb01.prod.example.com (Exadata VM) CDB Name: PRODCDB PDBs: PDB_OLTP, PDB_DWH, PDB_REPORTING Oracle: 19.22.0.0 Memory: 512 GB RAM (Exadata X8M-2 node) Scenario 1: “The Database Was Slow from 09:00 to 09:30 This Morning” Situation: Application team reports intermittent slowness on cdb01. You need to identify what happened between 09:00 and 09:30. ...

Oracle Real Application Testing (RAT) is the authoritative tool for validating changes to an Oracle database before production deployment. It enables you to replay a real production workload against a test system and measure the performance impact of changes such as database upgrades, parameter changes, hardware migrations, or schema modifications. This article walks through both RAT components — Database Replay and SQL Performance Analyzer (SPA) — with step-by-step procedures. RAT Component Overview Component What It Tests Best For Database Replay Entire production workload (concurrent sessions, timing, interactions) Database upgrades, hardware changes, OS upgrades SQL Performance Analyzer (SPA) Individual SQL statements from AWR SQL Tuning Set Optimizer changes, parameter tuning, index changes Both require the Oracle Real Application Testing licence option in addition to Enterprise Edition. ...

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