11.11 Downgrading Oracle Clusterware to an Earlier Release
After a successful or a failed upgrade, you can restore Oracle Clusterware to the previous release.
Downgrading Oracle Clusterware restores the Oracle Clusterware configuration to the state it was in before the Oracle Grid Infrastructure 18c upgrade. Any configuration changes you performed during or after the Oracle Grid Infrastructure 18c upgrade are removed and cannot be recovered.
To restore Oracle Clusterware to the previous release, use the downgrade procedure for the release to which you want to downgrade.
Note:
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Starting with Oracle Grid Infrastructure 12c Release 2 (12.2), you can downgrade the cluster nodes in any sequence. You can downgrade all cluster nodes except one, in parallel. You must downgrade the last node after you downgrade all other nodes.
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When downgrading after a failed upgrade, if the
rootcrs.sh
orrootcrs.bat
file does not exist on a node, then instead of the executing the script use the commandperl rootcrs.pl
. Use the Perl interpreter located in the Oracle Home directory.
- Downgrading Oracle Standalone Cluster to 12c Release 2 (12.2)
Use this procedure to downgrade Oracle Standalone Cluster to Oracle Grid Infrastructure 12c Release 2 (12.2) after a successful upgrade. - Downgrading Oracle Grid Infrastructure when Upgrade Fails
If upgrade of Oracle Grid Infrastructure fails before CVU post upgrade checks succeed, then you can rungridSetup.bat
and downgrade Oracle Grid Infrastructure to the earlier release. - Downgrading to Oracle Grid Infrastructure 12c Release 1 (12.1)
Use this procedure to downgrade to Oracle Grid Infrastructure 12c release 1 (12.1). - Downgrading to Oracle Grid Infrastructure 11g Release 2 (11.2)
Use this procedure to downgrade to Oracle Grid Infrastructure 11g Release 2 (11.2).
Parent topic: Upgrading Oracle Grid Infrastructure