Database Administration (MOSC)

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undo extents keep active

edited May 13, 2020 11:18AM in Database Administration (MOSC) 11 commentsAnswered

Hi,

I'm facing since several days about a problem of undo data on one database (Oracle 11.2.0.3, RAC 3 nodes). The undo tablespace of the node 2 don't stop to grow.

I checked the segments of this tablespace and there is one segment over 80Go ! When I checked the extents of this big segment, I note there a lot with an active status and they never change: they keep this status since several days. While the status keep unchange, Oracle don't reuse the existing extents so Oracle create new extents and the tablespace grow.

I thought that the problem comes from the transactions. I run a request to see if there is long time transaction in progress but no. I also checked if there are "dead" transactions by requesting the view x$ktuxe with no result too.

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