Have we ever questioned ourselves, why custom schema names always start with ‘XX<some_name>‘? Before getting into the detail let’s check what happens if the custom schema name doesn’t start with ‘XX’.
If you don’t have a custom schema name starting with ‘XX’, be assured that this schema will be no longer available in our instance when we perform an UPGRADE. During upgrade Oracle apps will clear all unregistered schemas, which doesn’t start with ‘XX’.
Oracle had assured its customers that it would not touch any schemas that start with ‘XX’. This is the main reason why we find custom schema names starting with ‘XX’.
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