Oracle Database Error Code ORA-30512 Description :
cannot modify string.string more than once in a transaction
Error Cause:
An attempt was made to modify an object more than once in a transaction. This error is usually caused by a DDL statement that fires a system trigger that tries to modify the same object. It can also happen when an attempt is made to perform more than one DDL operation on a queue table in the same transaction without issuing a commit between operations.
How to Solve :
Do not create system triggers that might modify an already modified object. Also, do not specify more than one DDL operation on a queue table in the same transaction.
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