I think I know the difference, but wanted to make sure. What is the difference between Replication and Clustering? My understanding is that in Replication, changes made on the Master Server are downloaded to a Slave server periodically, and thus, the slave server is up-to-date within a few minutes of the Master server.

Am I correct in assuming that in a cluster situation, there are actually multiple servers, all updated at the same time, and if any one goes down, then the others can pick up the slack?

Generally (don't need details, but a very general idea), what is involved in setting up each? What would be the cost of doing such for a business who has a "mission critical" web application accessed from all over the U.S.?

Thanks,
Jesse

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