{
  "vdb": [
    {
      "id": 1,
      "type": "int",
      "method": "hash",
      "num": 8,
      "partitions": {"data1": [0,1], "data2": [2,3], "data3": [4,5], "data4": [6,7]}
    },
    {
      "id": 2,
      "type": "int",
      "method": "range",
      "num": 0,
      "partitions": {"data1": 124999, "data2": 249999, "data3": 374999,"data4": 499999}
    }
  ],
  "table": [
    {"vdb": 1, "db": "employees_hash", "table": "dept_emp", "pkey": "emp_no"},
    {"vdb": 1, "db": "employees_hash", "table": "employees", "pkey": "emp_no"},
    {"vdb": 1, "db": "employees_hash", "table": "titles", "pkey": "emp_no"},
    {"vdb": 2, "db": "employees_range", "table": "dept_emp", "pkey": "emp_no"},
    {"vdb": 2, "db": "employees_range", "table": "employees", "pkey": "emp_no"},
    {"vdb": 2, "db": "employees_range", "table": "titles", "pkey": "emp_no"}
  ],
  "single_tables": [
    {"table": "regioncode", "db": "employees_hash", "group": "data1"},
    {"table": "countries",  "db": "employees_range", "group": "data2"}
  ]
}