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None of them do auto-sharding and master-master replication. This is the domain dynamo/bigtable-like systems (elasticsearch, riak, cassandra, hbase, voldemort)


Actually AFAIK MySQL supports master-master and the Cluster version supports autosharding.


Supports versus recommends are two different things. To do master-master correctly, you need either some sort of conflict resolution or a locking manager. MySQL has neither.




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