There are tons of restrictions for fast refresh!
Waleed
-----Original Message-----
Sent: Friday, June 21, 2002 3:33 PM
To: Multiple recipients of list ORACLE-L
Madhu,
Go tell that SrDBA to go read up on MV's. They do support a fast
refresh,
but you have to have a log table associated with the base tables in the
view.
You can also set it up so that when anyone makes a change to the base tables
the
MV gets updated as part of their transaction.
Dick Goulet
Senior Oracle DBA
OCP 8i
____________________Reply Separator____________________
Author: "Reddy; Madhusudana" <[EMAIL PROTECTED]>
Date: 6/21/2002 10:58 AM
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
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Author: Khedr, Waleed
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