RE: what is the difference between shared nothing and shared everything?

Shared-everything is even more tightly-coupled than RAC - shared-everything is communal memory bus, shared I/O channel, etc - many people list SMP as a shared-everything cluster, though something like a NUMA cluster is more appropriate. RAC would be defined as a "Shared-something" cluster - there is shared data access and some application-level memory sharing. The definition gets even fuzzier when you get into RDMA-based architectures like InfiniBand, where nodes are actually granting direct memory access to other nodes within a cluster. Soon enough, there will be "shared kinda-something-but-I-don't-really-like-them-that-way". DB2 is a shared-nothing cluster, though.

Thanks,
Matt

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> -----Original Message-----

> From: ml-errors_at_fatcity.com [mailto:ml-errors_at_fatcity.com] On 

> Behalf Of ryan_oracle_at_cox.net

> Sent: Wednesday, December 03, 2003 12:24 PM

> To: Multiple recipients of list ORACLE-L

> Subject: what is the difference between shared nothing and 

> shared everything?

> 

> 

> this has to do with RAC right? oracle uses shared everything 

> and ibm uses shared nothing right? 

> 

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> Please see the official ORACLE-L FAQ: http://www.orafaq.net

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> Author: <ryan_oracle_at_cox.net

>   INET: ryan_oracle_at_cox.net

> 

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