C H A P T E R 8
RAC and Ruin
Everything’s Negotiable!
Up to this point, everything I’ve said has been about a single instance addressing a single database; but Oracle allows multiple instances to share access to a single database, which means multiple independent data caches, multiple independent log buffers, and multiple independent SGAs—all accessing the same set of physical files, all using the same data dictionary. Without a constant stream of negotiation going on between instances, it would be impossible to ensure that the multiple instances behaved consistently, and we would see cases where data changes made by one instance were lost due to interference from another instance. This need for cross-instance traffic is the only significant ...
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