Column-family concept and data model

Question

I\'m investigating the different types of NoSQL database types and I\'m trying to wrap my head around the data model of column-family stores, such as Bigtable, HBase and Cas

Answer 1

As per my understanding, Cassandra ColumnFamily is not a collection of rows, rather it is cluster of columns. Column are clustered together based on clustering key. for example, lets consider below columnfamily:

CREATE TABLE store (
  enrollmentId int,
  roleId int,
  name text,
  age int,
  occupation text,
  resume blob,
  PRIMARY KEY ((enrollmentId, roleId), name)
) ;


INSERT INTO store (enrollmentid, roleid, name, age, occupation, resume)
values (10293483, 01, 'John Smith', 26, 'Teacher', 0x7b22494d4549);

Fetched inserted above details by using cassandra-cli, it is pretty well clustered based on clustering key, in this example "name = John Smith" is clustering key.

RowKey: 10293483:1
=> (name=John Smith:, value=, timestamp=1415104618399000)
=> (name=John Smith:age, value=0000001a, timestamp=1415104618399000)
=> (name=John Smith:occupation, value=54656163686572, timestamp=1415104618399000)
=> (name=John Smith:resume, value=7b22494d4549, timestamp=1415104618399000)