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Although Cassandra allows the definition of "columns" within a "table", these are much less strict than a relational database schema. As it says here different rows in the same column family do not have to share the same set of columns, and a column may be added to one or multiple rows at any time. In this world, the new value is only added to the ...


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As you have multiple rows inside the JSON column, you need a function that returns a set. This can be done using the json_to_recordset() function: select j.* from json_test, json_to_recordset(json_data) as j(name text, country text, hobby text, address text, sex text); Because this is an anonymous record type, you must explicitly define each column. ...


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Someone make this bench: http://mimdl.tumblr.com/post/115308901909/benchmarking-handlersocket-mysql-innodb-memcached Get Operation with HandlerSocket was completed in 1.20499610901 Sec, i.e; making 8,299 QPS (Queries per second) Get Operation with InnoDB Memcached Plugin was completed in .93115 seconds i.e; making 10,739 QPS Select Query for MySQL took ...


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Many NoSQL products have sharding built-in. The DBMS itself looks after storing a particular key range on a certain server and keeping redundant copies for high availability. Client connections are routed within the DBMS rather than in the application. Multi-server scale out becomes easy, at the cost of CAP compromises.



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