Master-Master replication for wide area configurations

[Michael Varlik]

Hi,

I have several sites which are connected via wide area networks.
Each of these sites has one MySQL database which serves it's local
clients. But the data from one single site has to be available to
all other sides. If possible in realtime.
First, I thought about setting up a cluster with data nodes spread
across all sites but this doesn't seem to be a good choice, isn't it?
Now I've read about master-master replication of MySQL Cluster CGE.

What exactly is master-master replication and can it be a suitable
technology to replicate data between several sites close to realtime?

Many thanks in advance for your sugestions.
Best regards,
Michael
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