In noSql, we have the column oriented ones like Hbase,Cassandra, the document oriented ones like MongoDb, CosmosDb. When should one go for a column oriented no sql data and when should one go for a document oriented one? Thanks
The main difference is that document stores (e.g. MongoDB and CouchDB) allow arbitrarily complex documents, i.e. subdocuments within subdocuments, lists with documents, etc. whereas column stores (e.g. Cassandra and HBase) only allow a fixed format, e.g. strict one-level or two-level dictionaries.
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