Oracle Database Discussions

Hello,

I am facing performance issue after doing database copy. Let me explain entire story.

Enviornment is Oracle 10g (10.2.0.4), Operating System is Solaries.

We have one production system with DB sid (PR1) and i have to builded new system using PR1 as PR2, we have done full offline copy from one hardware to another hardware (Hardware is same on PR1 and PR2) and perform rsync command at os level to sync all oracle files at OS level(PR2 is not build using backup/restore or export import method).

Now problem is that

One of query if i am running on PR1 system it is taking only 10-15 seconds, while if i am running same query on PR2 it is taking nearly about 55-60 mins. In initial search i found SGA is very diffrent from PR1 to PR2 then i did change the SGA parameter like PR1 in PR2 after doing changes i am running same query it is taking 6-7 mins, so i got some benifit here, but still i need to tune the query. Query contains 3 tables and all tables having atleast 3-4 indexes.

Can some one help what to tune and what to check?

Thanks,
Singh