MySQL makes the following statements about their Cluster:
- Near-linear scalability on preferred system configurations
- 99.999% availability
- Sub-second automatic failover
Oracle RAC requires shared access to storage. Such storage can be very expensive to purchase and maintain. MySQL Cluster requires no shared storage, and is relatively inexpensive to maintain. You can run the entire cluster on a single desktop machine. You can incrementally add commodity hardware to your cluster as needed.
See MySQL's Cluster description for more details.
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