Why in the version cumunity when I add a second node I can not uncheck the data service .
With Couchbase Server Community Edition, you can either run all services on all nodes or just the data service. Multi-dimensional scaling (MDS) allows you to turn off and on services as you like on each node, essentially dedicating a node to index or query service, or in the future, full text search. Only Enterprise Edition supports multi-dimensional scaling, because typically only enterprises need that for scaling purposes. Read more about MDS and the differences between CE and EE here: