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I hear a lot about couchdb, but after reading some documents about it, I still don't get why to use it and how.
Could you clarify this mystery for me?
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It is an open-source database that uses various different formats and protocols to store, transfer, and process its data. It uses JSON to store data, JavaScript as its query language using MapReduce, and HTTP for an API. Documents are the primary unit of data in CouchDB and they also include metadata.
Good use of CouchDB and other NoSQL repositories is for synchronizing data in an occasionally connected which makes sense in industries like finance, data collection, log analysis, IoT fields. The model is also beneficial for companies that have a distributed workforce like real estate or construction.
CouchDB accepts queries via a RESTful HTTP API, while MongoDB uses its own query language. CouchDB prioritizes availability, while MongoDB prioritizes consistency. MongoDB has a much larger user base than CouchDB, making it easier to find support and hire employees for this database solution.
Couchbase Server provides high availability for reading and writing of data through a variety of features. Couchbase provides high availability using intra-cluster replication and index replication, and disaster recovery using cross datacenter replication (XDCR).
It sounds like you should be reading Why CouchDB
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