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Windows is not officially supported but it should work, please let us know.
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With node partitioning (done via your application logic), virtually unlimited. For a single database instance, the practical scaling limits aren't yet known.
Or, where is my AUTO_INCREMENT?! With replication sequences are hard to realize. Sequences are often used to ensure unique identifiers for each row in a database table. CouchDB generates unique ids from its own and you can specify your own as well, so you don't really need a sequence here. If you use a sequence for something else, you might find a way to express in CouchDB in another way.
with a post body of
Where $source_database and $target_database can be the names of local database or full URIs of remote databases. Both databases need to be created before they can be replicated from or to.