Re: Mview refresh is much slower in 10g

Refresh method has been changed.
Previously (<9i) for complete refreshes Oracle did truncate mv and
insert /*+ append */.
Now (10g) it does delete, normal insert.

It is discussed for example here
http://asktom.oracle.com/pls/asktom/f?p=100:11:0::::P11_QUESTION_ID:15695764787749

Gints Plivna
http://www.gplivna.eu


2007/1/17, David Boyd <davidb158@xxxxxxxxxxx>:

Hi List,

Recently we upgraded our database from 9.2.0.6 to 10.2.0.2.  We have a
materialized view that joins two tables in the same database.  It takes 19
min to refresh in 9i, but it takes more than 1 hr in 10g.  The select
statement that creates the mview takes 300msec in 9i and 400msec in 10g.
Our system is Solaris 9 for Oracle 9i and Solaris 10 for Oracle 10g.  We use
exec dbms_refresh.refresh('"my_schema"."TEST_MV"') to refresh the mview.
Please advise how to speed up the refresh in 10g.  Also do we have to
regenerate stats every time after we refresh the mview?

Dave

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