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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 ...


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. ...


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 ...


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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