Can I do transactions and locks in CouchDB?
No. CouchDB uses an "optimistic concurrency" model. In the simplest terms, this just means that you send a document version along with your update, and CouchDB rejects the change if the current document version doesn't match what you've sent. It's deceptively simple, really. You can reframe many normal transaction based scenarios for CouchDB. You do need to sort of throw out your RDBMS domain know
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Frequently asked questions - Couchdb Wiki
Atomic transactions in key-value stores
