Review this checklist to prepare your Oracle Real Application Clusters (Oracle RAC) databases for upgrade.
Table 1-4 Oracle RAC Upgrade Checklist
|Review Existing Oracle Installations and Upgrade Plans||
To install Oracle RAC 18c, you must have Oracle Grid Infrastructure (Oracle Clusterware and Oracle ASM) 18c installed on your cluster. The Oracle Clusterware version must be equal to or greater than the Oracle RAC version that you plan to install.
|Ensure that Oracle RAC Databases You are Installing are Compatible with Existing Databases||
If you have Oracle Clusterware installed, and different releases of other Oracle software installed, then the Oracle Clusterware release must be later than or equal to the Oracle Database software release. Oracle Clusterware and Oracle ASM are both upgraded to 18c when you perform an Oracle Grid Infrastructure 18c installation.
If you have an existing Oracle home, then you can create a new Oracle home and install Oracle Database 18c into the new Oracle home. Ensure that Oracle Clusterware is in a separate Oracle Grid Infrastructure home. Oracle Grid Infrastructure for cluster installations cannot be installed in the Oracle home directory for Oracle Database.
|Migrate files from RAW devices to Supported Storage||If you have any database data stored on RAW devices, then before you start Oracle Grid Infrastructure and Oracle RAC installation, you must use RMAN to copy that data to Oracle ASM or to another supported file system.|
|Prepare to upgrade all existing nodes||The Oracle RAC database instance is running on the same nodes that you intend to make members of the new cluster installation. For example, if you have an existing Oracle RAC database running on a three-node cluster, then you must upgrade all three nodes. You cannot upgrade only two nodes of the cluster, removing the third instance in the upgrade.|
|Ensure that Oracle RAC database version is equal to or older than the version of Oracle Clusterware||
You can have multiple Oracle homes for Oracle databases on your cluster. However, the Oracle RAC database software in these homes must be from a version that is equal to or before the version of Oracle Clusterware that is installed. For example: