Grokking the System Design Interview, Volume II
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BigTable Data Model

We have seen what BigTable is for. Now we look at how it actually models data.

In simple terms, BigTable is a sparse, distributed, persistent, multidimensional, sorted map. We look at what each of those words means below.

A traditional database lays its data out in two dimensions. Each cell, the value stored where a row meets a column, is identified by a 'Row ID' and a 'Column Name':

BigTable's data model has four dimensions. Together, they locate the exact contents of one cell:

  1. Row key. Uniquely identifies a row.
  2. Column family. A group of columns.
  3. **Column name

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