Re: 9iRAC interconnect protocol

ge_2000_2001_at_yahoo.com (gdb_dsr) wrote in message news:<6299d152.0308261646.295d3344_at_posting.google.com>...
> Oracle9iRAC 9201/Linux(RH9.0) instance processes and oracm works using
> UDP protocol over cluster (ethernet) interconnect when I traced it. I
> want to configure and run on TCP.
> Wondering if someone knows about it. Thanks in advance.

Why on Earth would you want to use TCP instead of UDP???

TCP/IP was invented as a routable, error-corrected, protocol for heteorogenous networks (the name "Internet Protocol" is in there for a reason!). There is thus an awful lot of packet overhead to provide the necessary routing and error-correcting mechanisms, and the production of a TCP packet takes (relatively) a long time. This is an issue of high latency, and it will kill a RAC in its tracks, no matter how fast you then manage to actually ship the packet over the network cable.

UDP is (as I understand it) a cousin of TCP, but without the routing and error-correting stuff. It is a relatively low latency protocol. And it is thus ideally suited to use in a RAC.

RACs are not normally based on different machines in different countries. My cache fusion transfer of the EMP table block does not normally have to be routed via Switzerland. And TCP/IP is thus complete networking overkill for a RAC.

Stick with UDP, I think.
Regards
HJR Received on Wed Aug 27 2003 - 19:50:12 CDT