V$UNDOSTAT - contains less than 1008 rows and last DB restart in 12/2007

Hi all,
Our version is single instance Oracle 9.2.0.7.0 on AIX 5.3:
On our productive system (Datawarehouse with heavy data loads) the V$UNDOSTAT view contains not all rows for a 7-days cycle. When I step into the view there are less rows in it
(about 20- 50 or so).
On the other hand in our development system (separate server ,same OS, database) I can find all rows for the week. The only difference :-) seems to be the workload on the two different systems.
Can you give me a clue?
bb
Message was edited by:
berndboecker

Hi Kim,
the last instance start was on Dec. 15th, last year - so it has to contain 1008 rows.
I agree with you: I can think of only for a restart that the cycle starts again.
But this doesn't happen. But for some reason it cleans out the rows.
I can see this occuring several times per day.Let's say I query
Select count(*) from v$undostat
time t1: count(*) 10 " we had already some intervals in it, but not 1008 :-(
time t2 + 10 minutes count(*) 11 " fine
time t3 + 10 minutes count(*) 12 " fine
**** let's wait for an hour
time t9 + 10 minutes count(*) 8 "oops, we lost some rows again
In the Alert log I can see that the database did the usually checkpoints and archives
at that time.
The only implication I can think of is that the undo statistics are not really usefull for calculating a new undo retention time based on the workload in V$UNDOSTAT (you can get accurate values in the 7 days cycle but not with only some rows.

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