How to copy a set of tables from a database to another periodically?

We have a 4 node RAC primary database(10.2.0.2) with a physical standby(10.2.0.2) on our production site. Offlate we noticed that one of the applications(APP2) is causing heavy loads due large data downloads on the primary database servers. Our primary database has 2 schemas,
1) one being the main schema with all objects, (USER1)
2) and the other has views that query some set of tables from the main schema. (USER2)
The application APP2 uses USER2 views to query and download huge data periodically. We need to be able to give accurate data results to APP2, but in the same time take off the load from the database, as APP2 is not our main application.
We would like to know if there are any cost effective options in oracle to do this, and if so, what is the best option? Anyone has any experience setting up something like this before?
We have thought of creating another 10.2.0.2 database on a different server and giving it regular updates(like data feeds) from the current database. The current database data changes quiet often, so the data feeds would have to be done often to keep the data current on the new database. So, we are not exactly sure how to go about it. Would a COPY command help?
Please advice.

user623066 wrote:
Our 4 node RAC is already busy with our main application, which has its connections spread across all 4 nodes.
Our main applications services are the same on all nodes and use all 4 nodes in the same way.
There are some other utilities that we run from one of the app servers that connect to only 1 of the nodes.
APP2 uses all 4 servers, which is again controlled by connection pooling and distributes the load.Wouldn't separate services be more beneficial here? If APP2 is locked down to one node during normal operation, that ensures that other connections aren't going to be competing for hardware with APP2 on 3 of the 4 nodes. If APP2 is generating less than 25% of the total load, you can let the other applications use whatever hardware resources are left idle on the node APP2 is locked down to.
By Large data downloads, I meant both increase in network traffic and the CPU load on the database nodes.
We are already using resouce manager to limit the resources allocated to USER2 that APP2 uses.
And we have also limited the large downloads to take place in the early hours of the day when the traffic from our main application is less.
But this has still not been optimal for the usage requirements for APP2. APP2 is also doing queries all through the day, but has a limit for the number of rows downloaded during peak hours.Can you explain a bit more about why using Resource Manager hasn't been sufficient? That's normally a pretty good way to prevent one hungry user from drastically affecting everyone else. Perhaps you just need to tweak the configuration here.
Logical Standby seems a good option. But we need to keep our physical standby in place. Is it possible to have a logical standby and a physical standby? (ofcourse on separate servers)Sure. You can have as many standby servers of whatever type you'd like.
Could we use a COPY command to copy data for the set of tables to a new database? Or is that also a complex option?You could, yes. COPY is a SQL*Plus command that has been depricated for copying data between Oracle databases for quite a while. It only works from SQL*Plus and would only be designed for one-time operations (i.e. there is no incremental COPY command). I can just about guarantee that's not what you want here.
How do materialized views work? Wouldn't they still reside on the main database? Or is it possible to have remote materialized views?You probably don't want materialized views, but if you decide to go down that path
- You'd create materialized view logs on the base tables to track changes
- You'd create materialized views on the destination database that select data over a database link back to the source database
- You'd put those materialized views into one or more refresh groups that are scheduled to refresh periodically
- During a refresh, assuming incremental refreshes, the materialized view logs would be read and applied to the materialized views on the destination system to update the materialized views.
Justin

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