IMO views are often used as a substitute for creating reporting
structures.
Using views makes for easy report/SQL creation, but tends to be a
tuning and performance nightmare. It's hard to tune, and will likely
never perform well.
I'm going through similar issues here right now. A number of users
need to do reporting on production data. No way, no how will they
be allowed to do it on the production database. It's a manufacturing
database and performance is critical to this system.
I've done some prototypes of the tables they need to report on. Basically
a copy of the production tables in another database. Those that have a
long refresh cycle ( 1+ days ) get bitmap indexes on most columns. Those
that need to be close to realtime get Btree indexes instead and will be
refreshed every few minutes ( refresh time pending negotiation with users
:).
This is not exactly a data mart as I would like to have it: no star
schemas.
But it's what I have time for right now, gets the reports off of
production and
is *much* faster to query.
HTH
Jared
"Smith, Ron L." <[EMAIL PROTECTED]>
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02/21/02 08:18 AM
Please respond to ORACLE-L
To: Multiple recipients of list ORACLE-L <[EMAIL PROTECTED]>
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Subject: Anybody against using views?
We have several applications that use views extensively. On the other
hand
there are several apps that use no views at all. We have a new developer
who wants to use views when writing reports in Crystal Reports. The
application administrator is leery of using views and ask the DBA group
what
we think. I can see several reasons to use views and a few reasons not to
use them. I was just wondering what the rest of the group thought.
Ron Smith
DBA
Kerr-McGee Corp
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