Second call to DBMS_MVIEW.REFRESH takes much longer
- From: "Alex Gorbachev" <gorbyx@xxxxxxxxx>
- To: "oracle-l@xxxxxxxxxxxxx" <oracle-l@xxxxxxxxxxxxx>
- Date: Fri, 26 May 2006 18:08:31 +0200
Hi all,
I don't have much exposure to materialized views so, perhaps, it's a
simple question.
I created materialized view log. Than I created materialized view base
on prebuilt table (filled just before that). Than I run
DBMS_MVIEW.REFRESH to fast refresh - it took some time and finished
successfully. Almost right after that I run DBMS_MVIEW.REFRESH again
and this was taking looooong time and finally failed with snapshot too
old (well retention period is not very high on this DB).
So the question is why it takes longer to refresh second time? I would
expect the second run to be much faster. I checked in
V$SESSION_LONGOPS and it looks like it's going quickly in the
beginning and slows down a lot at the end (Full scan of MLOG$_ table).
TIA.
--
Best regards,
Alex Gorbachev
http://oracloid.blogspot.com
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