I have to reset the HWM for marbles MV?
Hi allI have inhereted a system, which have hourly jobs to truncate the MV newspapers whenever they are empty, the job name is HWM of reset for newspapers of MV
in a high OLTP system can MV newspapers size becomes very large due to repeated insertion/removal automatic?
from my point of view, this isn't a big problem?
someone face or have a similar job in his approx., as I think to stop him.
Thank you
Obviously, the first update after the TRUNCATE will have to be a FULL refresh.
It is possible for a newspaper of the too large MView. This usually happens in both
a. the base table has a high rate of DTF, but the MV update are performed after a big lag in time (for example every 12 hours)
b. a built MV on the base table has only refreshing but was not removed correctly. This causes the MV to stay enrolled and MV journal to continue to grow because the MV does not have the records purge.
Too much ('' how big is big? '' one responds with 'it depends') MV journal CAN quickly slow Refreshs.
I guess he was (or is probably), at some time in the past, a MV that had stopped refreshing and the DBA / Apps Team couldn't understand why newspapers on the base tables MV grew too great, so they have implemented a purge.
Then it becomes like "run us this script, because he was executed by the previous DBA, we don't know why" typical of action.
See the MetaLink Notes 1031924.6 and 412400.1 and even 420040.1
Hemant K Collette
http://hemantoracledba.blogspot.com
Tags: Database
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