text: create keyspace ycsb WITH REPLICATION = {'class' : 'SimpleStrategy', 'replication_factor': 3 };
  USE ycsb;
  create table usertable (
      y_id varchar primary key,
      field0 varchar,
      field1 varchar,
      field2 varchar,
      field3 varchar,
      field4 varchar,
      field5 varchar,
      field6 varchar,
      field7 varchar,
      field8 varchar,
      field9 varchar);
  