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How to identify the DML which cause the extensive undo reads

edited May 2, 2015 10:02AM in Database Tuning (MOSC) 2 commentsAnswered

RDBMS 10.2.0.5.   We had a SQL query sometimes runs longer due to extensive undo reads.  It could be caused by DML statements does not commit or the query started before the DML commits.  Anyway, how to identify the DML (or DMLs)?  Thanks

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