Oracle Real cluster application? My application is working in Real cluster application(RAC)in production. I am new to RAC and  gone through this video . 

My understanding after reading this 


RAC uses more than one node only for data processing the data in memory but still uses one node to store data
processing can be like applying index, order by clause, any function etc
So its the load distribution at processing level not at data storage level


Is my understanding correct ?
Data is stored on shared storage. Nodes do not store any data, they just process it.
Yes.
Yes.