Comment on Performance Stories from Exadata Migrations by Som Shekhar

Hi,
Very nice and informative presentation.
Well i have not worked on Oracle Exadata, but gathering what all is available on net and trying to compare with the NoSQL data bases like Cassandra, HBASE, Couchve, Mongo etc..It would be great if you can throw some light on the following questions:

1. What is the write latency? For example:if i have billion records per second coming to me, then how much does time it takes to load into OLTP?
2. What would be the read latency if simulatenous writes are also happening?:
Consider the worst case scenario and full peak load

Thanks and Regards,
Som Shekhar