High Level Steps to Upgrade RAC DB from 12c to 19C

Check active version and Software Version of  Cluster in Pre Upgrade Environment .   
  • crsctl query crs activeversion
  • crsctl query crs softwareversion

PRECHECKS:

  1.  Apply required patches to your existing 12c grid
  2.  Download the software and unzip on your first node
  3.  Run the orachk tool as grid owner          -  orachk tool will generate a html report for recommendation, that need to be taken care before  upgrading.       
      export GRID_HOME=/u01/app/oracle/grid19c
      cd /u01/app/oracle/grid19c/suptools/orachk/
       ./orachk –u -o pre
  4. Run cluvfy as grid owner - cluvfy tool will verify configuration of GRID services for upgradation
  5. ./runcluvfy.sh stage -pre crsinst -upgrade -rolling -src_crshome /u01/app/12.2.0/grid -dest_crshome /u02/app/19.3.0/grid -dest_version 19.0.0.0.0 -fixup -verbose
  6.  DRY RUN PHASE:( GUI Method) ---Dry run phase will  not do any changes to the existing grid setup. It will just check the system readiness.
    • Validates storage and network configuration for the new release
    • Checks if the system meets the software and hardware requirements for the new release
    • Checks for the patch requirements and apply necessary patches before starting the upgrade
    • Writes system configuration issues or errors in the gridSetupActions<timestamp>.log log file
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