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RAC Database upgrade using DBUA fails with error ORA-01102 (Doc ID 1545443.1)

Last updated on MARCH 13, 2019

Applies to:

Oracle Database - Enterprise Edition - Version to [Release 11.2]
Oracle Database Cloud Schema 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
Oracle Database Backup Service - Version N/A and later
Information in this document applies to any platform.


 Database upgrade using DBUA fails, the below errors.

[Thread-228] [ 2013-04-11 14:50:27.409 EDT ] [SummarizableStep.genSummary:409] Generating Summary for:=Oracle Server ,status is:=Failed
oracle.sysman.assistants.util.step.StepExecutionException: Failed to start the RAC database exclusively in UPGRADE mode. The following error occured:
ORA-01102: cannot mount database in EXCLUSIVE mode

Upgrade failed due to running the step "Upgrading Oracle Server"
at oracle.sysman.assistants.dbma.backend.component.SubComponent.executeSubStepImpl(
at oracle.sysman.assistants.dbma.backend.component.SubComponent.executeStepImpl(
at oracle.sysman.assistants.dbma.backend.component.Component.executeStepImpl(
at oracle.sysman.assistants.dbma.backend.SummarizableStep.executeImpl(
at oracle.sysman.assistants.util.step.BasicStep.execute(
at oracle.sysman.assistants.util.step.Step.execute(
at oracle.sysman.assistants.util.step.StepContext$

Database alert log file indicates, the remote instance of the database is automatically getting started during the upgrade.

* instance 2 at version, rolling upgrade from before <<<
USER (ospid: 10953): terminating the instance due to error 1102

oerr ora 1102
01102, 00000, "cannot mount database in EXCLUSIVE mode"

// *Cause: Some other instance has the database mounted exclusive or shared.
// *Action: Shutdown other instance or mount in a compatible mode.



 Database upgrade


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