oracle cache fusion against informix XPS?

Hi Gurus, I was an Informix man , but my last job needs Oracle skills which i have no experience. My question is about oracle real application clusters. I know that oracle's shared everything architecture uses Dlm (distributed lock manager ) and for large installations this was a problem. But all the oracle white papers say this was history. Their cache fusion tech. solved all the problems. Is there any one who can comment on this? Kind Regards, hope

> Is there any one who can comment on this? Sure - here to help :-) The DLM was never really that big a problem, although people liked to think it was. The real issue was as follows Setup ----- Block A on disk Block A loaded into memory on Node 1 Block A loaded into memory on Node 2 Change to Block A in memory on Node 1 Change or Read of Block A in Memory on Node 2 requires a synchronization Previous Behaviour ------------------ 1) Node 1 would write changed block to disk 2) Node 2 would read changed block from disk for the query This was known as a 'ping', and IO could quickly become a bottle neck if you didn't design your app to reduce the number of cross node 'pings' of data. And after the re-design, you would need to then partition your data to make the design work Now, with Cache Fusion ---------------------- 1) Node 1 pokes the changed block from it's memory to Node 2's memory No IO, no need to re-design app, partition data etc