AWR report shows "Disk File Mirror Read" in the Top 5 Timed Foreground Events

(Doc ID 1913253.1)

Last updated on MARCH 21, 2018

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2 to 12.1]
Information in this document applies to any platform.


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:



 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.


Sign In with your My Oracle Support account

Don't have a My Oracle Support account? Click to get started

My Oracle Support provides customers with access to over a
Million Knowledge Articles and hundreds of Community platforms