Downgrading Oracle Clusterware After an Upgrade
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 12c Release 2 (12.2) upgrade. Any configuration changes you performed during or after the Oracle Grid Infrastructure 12c Release 2 (12.2) 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:
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.
Note:
When downgrading after a failed upgrade, if therootcrs.sh or rootcrs.bat file does not exist on a node, then instead of the executing the script use the command perl rootcrs.pl . Use the perl interpreter located in the Oracle Home directory.
- Options for Oracle Grid Infrastructure Downgrades
Understand the downgrade options for Oracle Grid Infrastructure in this release. - Restrictions for Oracle Grid Infrastructure Downgrades
Review the following information for restrictions and changes for downgrading Oracle Grid Infrastructure installations. - 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) . - Downgrading Oracle Grid Infrastructure after Upgrade Fails
If upgrade of Oracle Grid Infrastructure fails before setting the active version of Oracle Clusterware, then follow these steps to downgrade Oracle Grid Infrastructure to the earlier release. - Downgrading Oracle Grid Infrastructure after Upgrade Fails on Remote Nodes
If upgrade of Oracle Grid Infrastructure fails on remote nodes, then you can follow these steps to downgrade Oracle Grid Infrastructure to the earlier release.
Parent topic: Upgrading Oracle Grid Infrastructure