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You are probably hitting the varchar2() max lenght rather than a the "120 concatenated columns limit" you are suggesting.
Take into consideration that if any of your concatenated columns is of the varchar2() datatype, your resulting concatenated string is a varchar2() therefore the 4,000 chars limit applies.
You can test this theory by checking the size of your concatenated strings.
Pablo (Paul) Berzukov
Author of Understanding Database Administration available at amazon and other bookstores.
Disclaimer: Advice is provided to the best of my knowledge but no implicit or explicit warranties are provided. Since the advisor explicitly encourages testing any and all suggestions on a test non-production environment advisor should not held liable or responsible for any actions taken based on the given advice.
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