How Performance can be improved at Oracle Database level

Hi Everyone,
Need a suggestion ......
I m managing SAP Landscape of Retail Sector Client.
where SAP ERP PRD database size is : 2 TB.
at SAP Application Layer .... we have setup five application system to distribute load because around 1200 users work concurrently.
Out of these 1200 Users around 300 Users keeps on fetching
reports from database which worsen database performance.
We have changed parameters of Database to improve performance.
What we have thought to setup replica of PRD system .
On which Only Report Users will execute reports.
& that System will work as Disaster Recovery Site of PRD System.
In process of that We have restored the PRD Backup on another System. But How can we replicate daily changes of PRD System on Restored System.
One which we have thought by applying offline archive files.
    daily . But somebody has told us that we can not apply
    offline archive files of PRD System to restored system
    because that Restored database is in Open stage & being
   used.
(ii) Secondly, Incremental Backup which is very time-consuming action.
Please suggest , If you have an idea & I want to know How
offline archive log file application on DR Site .
Thanks in advance !!!
Points will be rewarded !!!
Thanks
Deepak !!!

deepak gosain wrote:>
> Hi Everyone,
Hi Deepak!
> Need a suggestion ......
I'll try my best
> I m managing SAP Landscape of Retail Sector Client.
> where SAP ERP PRD database size is : 2 TB.
> at SAP Application Layer .... we have setup five application system to distribute load because around 1200 users work concurrently.
>
> Out of these 1200 Users around 300 Users keeps on fetching
> reports from database which worsen database performance.
Hmm.. might happen.
> We have changed parameters of Database to improve performance.
Oh - which ones? Why? Who told you to?
> What we have thought to setup replica of PRD system .
> On which Only Report Users will execute reports.
> & that System will work as Disaster Recovery Site of PRD System.
This setup does not work for SAP environments. To get reports out of a system with SAP the database must be open to writes.
> In process of that We have restored the PRD Backup on another System. But How can we replicate daily changes of PRD System on Restored System.
Such thing would be done via a Standby-DB.
> One which we have thought by applying offline archive files.
>     daily . But somebody has told us that we can not apply
>     offline archive files of PRD System to restored system
>     because that Restored database is in Open stage & being
>    used.
That person told you the truth.
> (ii) Secondly, Incremental Backup which is very time-consuming action.
Depends on your reference. Compared to what is it very time-consuming?
Compared with a full DB-Backup this is likely to be the less time-consuming option.
> Please suggest , If you have an idea & I want to know How
> offline archive log file application on DR Site .
For a how-to in Standby-Setup you may want to have a look into the Oracle documentation like here [Introduction to Oracle Data Guard |http://download.oracle.com/docs/cd/B19306_01/server.102/b14239/concepts.htm#SBYDB00010]
> Thanks in advance !!!
You're welcome !!!
> Points will be rewarded !!!
Oh - nice !!!!!!!!!!
Now get a bit earnest as well:
From what you described it sounds like you're setup is a bit undersized.
If your report users use BI for their reports, than it may pay off to setup a seperate BI system that gets it's data from the ERP system automatically and not whenever a user starts a report.
Another option may be to consider using a RAC cluster - but this would be a very expensive option.
In any case the important first step has to be to find out, what the real cause for the performance degration is.
Perhabs the I/O Subsystem is the problem, perhabs the network. Perhabs another CPU would do wonder.
You'll never know - before you analyse this in depth.
Reading hints would include these notes:
618868     FAQ: Oracle performance
72638     Performance problems with SQL*Net
354080     Note collection for Oracle performance problems
853576     Oracle 10g: Performance analysis w/ ASH and Oracle Advisors
793113     FAQ: Oracle I/O configuration
619188     FAQ: Oracle wait events
805934     FAQ: Database time
Best regards,
Lars

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