ORA-03170：deadlocked on readable physical standby (undo segment string)
错误码
错误描述：deadlocked on readable physical standby (undo segment string)
错误原因：A new undo segment was added. A query can occasionally deadlock when issued around the time an undo segment is added and used immediately on the primary.
解决方法：Retry the query. Avoid creating new undo segments when using standby as a regular part of operation.
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