Big Complex MV creation and Refresh

From: Sanjay Mishra <"Sanjay>
Date: Fri, 13 Apr 2018 22:00:36 +0000 (UTC)
Message-ID: <>

I had a View which is Select from multiple Tables and joins. Selecting data from it take lots of time and been used extensively. I am planning to create MV on it as Data from View is only changed once a week. There are time when this view is not accessed and so can use the timeframe. Question is 1. If I use create MV with parallel  and select * from View; will be paralleling. I  used this method and it took 16hr to refresh. Not sure how I can more advantage with Parallel Query to speed up the creation and there after Refresh. Is following will help where View is based on multiple tables and not sure Paralle Select from view can help  Original Def    create Materialized view test parallel 20 refresh with rowid as select * from test_view;  Or this will be better    create Materialized view test parallel 20 refresh with rowid as select /*+parallel(10) */* from test_view;  Or I had to change the view defintion to also include Parallel in all Select in it to Trying to understand as how Parallel Query can help. None of the table involved in the view are partitioned.  2. Checking few sites and came to know Refresh will not be Parallel unless all select has parallel in it. As otherwise refresh will be serial.

thanks for suggestion and any reference  Sanjay

Received on Sat Apr 14 2018 - 00:00:36 CEST

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