Quite useful to uncover some of the nuances of the new upgrade procedures.
In this post i will list out the steps for upgrading R12.2 to R12.2.3
Note:
If you are freshly installing R12.2. and downloading the stage from edelivery then you will get stardCD version 12.2.0.46, also i would suggest you all to download startCD version 12.2.0.47 it includes lot of updates which will be helpful in reducing the R12.2.3 upgrade time. startCD version 12.2.0.47 is a patch with #17445880.
So when you are downloading the Media R12.2 Software, you will get stardCD 12.2.0.46 from edelivery. In your downloads include new startdCD version 12.2.0.47 patch #17445880
Once you build the stage using buildstage.sh we need to update the Start Here DVD, uncompress the patch in the main staging area to overwrite the startCD directory.
unzip -o p17445880_R12_GENERIC.zip let the existing 12.2.0.46 get overwritten by 12.2.0.47 startCD patch
Now you must run the buildStage.sh script and select option 2. Copy new patches to current stage area…
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Thoughts from James H. Lui 