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Problem upgrading Postgres to V13 on Big Sur #410

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OK - after A LOT of trial and error I have found the problem. The brew postgresql-upgrade-database script calls the pg_upgrade command and one of the parameters it passes is related to the number of simultaneous processes or threads to use (-j or --jobs). In my particular case it was using -j 12.

Running the upgrade process manually without this parameter allowed the upgrade to proceed smoothly without error. No idea why this would be the case but hopefully this post will help someone else in this situation.

Thanks
Steve

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@SteveHawes
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