Hi

Normally how long does it take for Complete RAC installation ? From creating oracle user till final steps of creating RAC Database on 2 node RAC ?

Depends because there are a lot of steps involved....

http://www.dba-oracle.com/t_rac_installation.htm

http://www.remote-dba.net/shad_oracle_rac_monitoring.htm

>> From creating oracle user till final steps of creating RAC Database on 2 node RAC ?

If you know what you are doing it take take just a few hours.

You can also install RAC with hardly any downtime:

http://www.dba-oracle.com/t_low_downtime_upgrades.htm

If you want a complete step-by-step checklist of the RAC install tasks, see here:

http://www.rampant-books.com/book_0401_10g_grid.htm

The first time I did it, it took several hours (nearly a day). The main things (for me) were making sure that the kernel parameters were spot on.

The second and subsequent times were much quicker though, as the hardware was the same, I was able to make use of many of the config files I had created for the first RAC.

I always make sure that the cluvfy scripts all complete properly before moving on from each step - it makes it a lot easier in the long run!