Materialzied Refresh is very slow in oracle10g

We are migrating our database from Oracle8i-->Oracle10g.
But in dataware housing we are facing problem for refresh materialized view is very slow
We change due to this below.
1. exec DBMS_MVIEW.REFRESH('MVIEW,atomic_refresh => FALSE );
Our two parameter are same as Oracle8i
query_rewrite_enabled = TRUE
query_rewrite_integrity = enforced
Please suggest to make it fast
Thanks
Chetan

ChetanS wrote:
We are migrating our database from Oracle8i-->Oracle10g.
But in dataware housing we are facing problem for refresh materialized view is very slow
We change due to this below.
1. exec DBMS_MVIEW.REFRESH('MVIEW,atomic_refresh => FALSE );
Our two parameter are same as Oracle8i
query_rewrite_enabled = TRUE
query_rewrite_integrity = enforced
Please suggest to make it fastChetan,
depending on your MV definition it might not be the refresh DML but the query that is taking substantially longer than in your 8i environment. May be you want to compare the performance of your query by simply running a CTAS statement using the MV query to find out whether it's a DDL/DML/fast refresh issue or a query related performance issue.
Do you use the FAST refresh method, i.e. do you have MV logs on the base tables or is this a complete refresh?
Regards,
Randolf
Oracle related stuff blog:
http://oracle-randolf.blogspot.com/
SQLTools++ for Oracle (Open source Oracle GUI for Windows):
http://www.sqltools-plusplus.org:7676/
http://sourceforge.net/projects/sqlt-pp/

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