Database Administration (MOSC)

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UNDO TBS Out OF Space

edited Apr 29, 2016 5:03AM in Database Administration (MOSC) 5 commentsAnswered

Hi Guys,

a production db 11.2.0.4 used many db_links to load data from other DBs. The Load on it is usually every morning from 08 till 09 AM.

what happened that the DB is out of UNDO Space on Mondays.

I've compare to check what happened and see why the db uses more undo space on Monday and here what I got:

1st = Monday  08:00 till 09:00

2nd= Tuesday 08:00 till 09:00

- in both times the top events are the same .. "row cache lock", which related to high querying a sequence (5000+) and it created without cache.

what I noticed also that on Monday there a high parsing of: "Top Comparision by Execuation"

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