AW: Database Views

You also can use materialized views (snapshots), which can be populated every night.

regards

Volker Schoen
E-Mail: mailto:v.schoen_at_inplan.de
http://www.inplan.de

-----Ursprüngliche Nachricht-----
Von: adary_at_mehish.co.il [mailto:adary_at_mehish.co.il] Gesendet: Donnerstag, 17. Januar 2002 14:51 An: Multiple recipients of list ORACLE-L Betreff: RE: Database Views

Hello Srini

We had a case like this where one of the tables was in a database that reside in a remote site. Our solution was to create a table that combine employees tables from 2 site into one TABLE in the local site.

This way the select and join is done ONCE at night.

Yechiel Adar, Mehish Computer Services
adary_at_mehish.co.il

> -----Original Message-----
> From: SRAJENDRAN_at_nlfs.com [SMTP:SRAJENDRAN_at_nlfs.com]
> Sent: Wed, January 16, 2002 10:05 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Database Views
>
> I would like get your opinion on what would be the best way provide
> access to data across multiple databases on just on Node (database).
>
> One way that I have tried is create a view on one database that reads
> tables across remaining four databases using Dblinks. Let us say
> there is a table
> called CUSTOMER that resides on five databases, in order to make it easier
> to generate reports, a combined view can be created with dblinks on these
> tables using UNION ALL on one database.
>
> Only concern I have is that when using Dblinks, Oracle might copy the
> entire remote table to the local database and then retrieve the data
> based on where
> clause. This might be a significant performance issue especially if the
> tables are very BIG.
>
> If there are better ways to accomplish this or any ideas on this one
> will be greatly appreciated.
>
> Thank you,
> Srini
>
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> INET: SRAJENDRAN_at_nlfs.com
>
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