ORA-24780：cannot recover a transaction while in an existing transaction
错误码
错误描述：cannot recover a transaction while in an existing transaction
错误原因：An attempt was made to commit or roll back a transaction while in a different transaction, and the transaction for which the action is requested is in a recovery state (this happens if it is idle too long).
解决方法：Detach from the current transaction and retry the operation.
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