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tkprof report appears to have disk I/O reported relating to FLASHBACK loggin activity.

edited Nov 26, 2013 6:32PM in SQL Performance (MOSC) 5 commentsAnswered
Hi All,

Please could someone help me with my understanding of the tkprof report below where I believe that the disk I/O reported is due to FLASHBACK database being ON.

My question is "why are the db file sequential reads reported against the SQL statement in question". I would have thought the maintenance of the FLASHBACK log is an Oracle background task and would not appear against an individual statement.

This tkprof report confuses me since I expected the update of the same row many many times would mean that the updated data remains in the cache. I wondered where the disk io and sequential reads could be coming from.

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