Workaround for Automatic Diagnostic Repository Errors when executing "validate database" through Data Guard Broker

If you have a Data Guard setup and using the broker, you may see the following error when validating your setup before a switchover:

DGMGRL> validate database stb01

  Database Role:     Physical standby database
  Primary Database:  proddb01

  Ready for Switchover:  Yes
  Ready for Failover:    Yes (Primary Running)

  Flashback Database Status:
    proddb01:  Off
    stb01:     Off

  Managed by Clusterware:
    proddb01:  NO
    stb01:     NO
    Warning: Ensure primary database's StaticConnectIdentifier property
    is configured properly so that the primary database can be restarted
    by DGMGRL after switchover

  Automatic Diagnostic Repository Errors:
    Error                       proddb01 stb01
    System data file missing    NO       YES
    User data file missing      NO       YES

This problem and its solution is outlined in Doc Id 2300040.1 "Known issues when using "Validate database" DGMGRL command" at Oracle Support.

Cause: The issue occurs because the old health check messages were not purged properly and the command VALIDATE DATABASE signals it found a failed check.

To get rid of this warning, rename the file HM_FINDING.ams from the ADR rdbms metadata folder or move it to another folder. This is what I did on my standby server:

 cd /u01/oracle/diag/
find . -name "HM_FINDING.ams"
./rdbms/stb01/stb01/metadata/HM_FINDING.ams
./rdbms/stb01/proddb01/metadata/HM_FINDING.ams
./plsql/user_oracle/host_1804485962_107/metadata/HM_FINDING.ams

Rename or remove the files listed above and execute the "validate database" command in dgmgrl again. The message should now be gone for good.

Note that the file named HM_FINDING.ams will most likely reappear immediately after deletion. But this new copy will not cause the Data Guard Broker to throw warnings.