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AWR report shows "Disk File Mirror Read" in the Top 5 Timed Foreground Events (Doc ID 1913253.1)

Last updated on FEBRUARY 21, 2019

Applies to:

Oracle Database - Enterprise Edition - Version 11.2.0.3 to 12.1.0.2 [Release 11.2 to 12.1]
Oracle Database Cloud Schema Service - Version N/A and later
Oracle Database Exadata Express Cloud Service - Version N/A and later
Oracle Database Exadata Cloud Machine - Version N/A and later
Oracle Cloud Infrastructure - Database Service - Version N/A and later
Information in this document applies to any platform.

Symptoms

The "Disk file Mirror Read" waits are observed in the Top 5 Timed Foreground Events section of the AWR report, like this:

 

 

 

 

 

 

 

To see this symptom all of the following must be true:

 

Changes

 There was a code change to do with the mirrored controlfiles, that results in the increased wait count of the "Disk file Mirror Read" event.

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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