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High 'latch: row cache objects' contention may be seen on dc_rollback_segmentstogether with high 'enq: US - contention' waits when using system managed undowith an auto tuned undo retention period. As another aspect, long running query can raise tuned_undoretention tovery high value and exhaust undo tablespace resulting in ORA-1628.Workaround Disable auto tuning by setting "_undo_autotune" = false记录于此备查
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