文档解释 ORA-30512: cannot modify string.string more than once in a transaction Cause: An attempt was made to modify an obje
ORA-30512: cannot modify string.string more than once in a transaction
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.
Action: 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.
ORA-30512错误指示用户不能在一个事务中多次修改字符串变量。
ORA-30512 occurs when an attempt is made to modify a string type more than once within one transaction. It is similar to the error ORA-06512 which occurs when an attempt is made to modify a numeric type more than once within one transaction.
这个错误通常出现在内部存储过程使用影响到字符串变量的语句(例如UPDATE)的情况下,程序在同一事务中对字符串变量进行了多次操作。
1.检查程序中的事务判断,或者单步调试程序,确认字符串变量被操作的次数。
2.如果字符串变量被多次操作,需要将程序中的事务判断修改,使得每次修改字符串变量为一个事务,以避免程序中出现ORA-30512错误。
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