AWR report shows "Disk File Mirror Read" in the Top 5 Timed Foreground Events
(Doc ID 1913253.1)
Last updated on APRIL 12, 2024
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:
- RAC database
- Control file(s) in a normal or high redundancy ASM disk group
- Minimum database version
- 11.2.0.3.11 Database Patch Set Update
- 11.2.0.3 Bundle Patch 20 for Exadata Database
- 11.2.0.3 Patch 32 on Windows Platforms
- 11.2.0.4 (Server Patch Set)
- 12.1.0.1 (Base Release)
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 |