Message-ID: <F001.00484767.20020621105839@fatcity.com>
Date: Fri, 21 Jun 2002 10:58:39 -0800
To: Multiple recipients of list ORACLE-L <ORACLE-L@fatcity.com>
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From: "Reddy, Madhusudana" <Madhusudana.Reddy@bestbuy.com>
Subject: Suggestions on MV Implementation !!!!!!!
Organization: Fat City Network Services, San Diego, California
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Hello All,

I have a set of Materialized views in my DB . we refresh ( COMPLETE) these
MVs, couple of times a day. Web server ( application ) will hit these MVs to
show the data on web pages. But the complete Refresh of MVs are consuming
much time and , at this point of time , Application is not able to show
right data on web pages. This is like a down time. I need some suggestions
from you all, in order to minimize or zeroing this down time.

The first thing I can think of is , FAST refresh , but one of my Sr.DBA told
me that the MV definition will not allow us for a FAST refresh( Are there
any limitations for FAST refresh ???? ). Here is a sample MV Definition :

CREATE MATERIALIZED VIEW GENRELOB
  NOLOGGING
  BUILD IMMEDIATE
  REFRESH COMPLETE ON DEMAND
  DISABLE QUERY REWRITE
AS SELECT DISTINCT
  '1' AS CLIP, 
  LOB.LOB_ID,
  LOB.LOB_CD,
  GENRE.GENRE_ID,
  GENRE.GENRE_DESC,
  GENRE.GENRE_DESC AS INSTANCENAME
FROM
  GENRE, 
  GENRE_LOB_XREF, 
  LOB,
  GENRE_PRODUCT_XREF
WHERE
  GENRE.GENRE_ID = GENRE_LOB_XREF.GENRE_ID AND
  GENRE_LOB_XREF.LOB_ID = LOB.LOB_ID AND
  GENRE_PRODUCT_XREF.genre_id = GENRE.genre_id AND
  GENRE.DSPLY_IND = 'Y'
ORDER BY
  LOB_CD,
  GENRE_DESC
;


My Goal is to view the FRESH data on web pages all the time , irrespective
of MV Refresh. Would anybody suggest me some bright ideas , to have no or
less down time ???

Thanks in advance
Madhu V Reddy


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-- 
Author: Reddy, Madhusudana
  INET: Madhusudana.Reddy@bestbuy.com

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