Oracle-L: RE: DB Refreshes

From: DENNIS WILLIAMS <DWILLIAMS_at_LIFETOUCH.COM>
Date: Mon, 26 Aug 2002 09:23:22 -0800
Message-ID: <F001.004BFA7D.20020826092322@fatcity.com>

Gulamabbas - I was in agreement with you until you said "minimal work". Funny. I am going to list some alternatives for you to consider, but the best alternative will depend on 1) how large is your OLTP database, 2) how active is the data i.e., how many transactions are involved, 3) can the reporting database be stand-alone, or does its data need to be integrated with other data?

Snapshots, replication. Good if the OLTP database isn't too active, but it can impose a load on the production system. If you can wait and resynchronize the databases at night when activity is lower, this will help. There are other alternatives along these lines, but these work best if there is minimal update activity.
RMAN DUPLICATE command can recover the database with minimal impact on the OLTP database.
Hot backup / clone. If you are using o.s. hot backups, these can recreate a cloned database on the reporting system.
Transportable tablespaces.
Oracle standby database. Apply the archive logs from the OLTP database at night, switch it to being a reporting database during the day. With Oracle9i, you can do both simultaneously which means your reporting database can function as an current standby for production.

Dennis Williams
DBA
Lifetouch, Inc.
dwilliams_at_lifetouch.com

-----Original Message-----
Sent: Monday, August 26, 2002 11:28 AM
To: Multiple recipients of list ORACLE-L

Hello All

I am in need to know/leanr about the database refreshes. Here is my situation. We have OLTP database which is 24/7 and we need to provied to the client a copy of the same OLTP database refreshed daily for their reporting puposes. Any ideas/suggestions how best can I do this, with minimal work? I am currently reading about ORACLE Snapshots. We are running ORACLE 8.1.7.3.0 on Tur64 Unix.

Thanks

Gulamabbas Sikiladha
1315-2850 Cedarwood Dr
Ottawa, Ontario
Canada
K1V 8Y4
Tel : (613) 260 0336

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Author: DENNIS WILLIAMS
INET: DWILLIAMS_at_LIFETOUCH.COM

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