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Interpreting Svctm, Await, Avgqu-sz, and %Util from Linux Iostat Results And Aligning with AWR Report Histograms (Doc ID 2229837.1)

Last updated on JULY 13, 2021

Applies to:

Oracle Database - Enterprise Edition
Oracle Database Cloud Schema Service - Version N/A and later
Gen 1 Exadata Cloud at Customer (Oracle Exadata Database Cloud Machine) - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Oracle Database Cloud Exadata Service - Version N/A and later
Generic Linux

Purpose

This article is intended to help troubleshoot intermittently slow IO under the database.  Iostat fields are often misinterpretted.  This article explains how key iostat metrics work, including summarizing their algorithms.  This helps DBAs and engineers to understand correlation with other tiers such as database in order to align with AWR reports, etc.

Troubleshooting Steps

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