Oracle Database Discussions

Hi DBAs,


I have setup a 2 node Oracle RAC 10.2.0.3 on Linux 4.5 (64 bit) with 16 GB memory and 4 dual core CPUs each. The database is serving a web application but unfortunately the system is at its knees. The performance is terrible. The storage is a EMC SAN but ASM is not implemented with a fear to further degrade the performance or not to complicate the system further.

I am seeking the expert advises from some GURUs from this forums to formulate the action plan to do the root cause analysis to the system and database. Please advise me what tools I can use to gather the information about the Root Cause. AWR Report is not very helpful. The system stats with top, vmstat, iostat only show the high resource usage but difficult to find the reason. OEM has configured and very frequently report all kind of high wait events.

How I can use effectively find Network bottle necks (netstat command which need to be really helpful to understand).
How I can see the system I/O (iostats) which can provide me some useful information. I don't understand what sould be the baseline or optimal values to compare the I/O activities.

I am seeking help and advised to diagnose the issue. I also want to represent this issue as a case study.

Thanks
-Samar-