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High-level Architecture
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This lesson gives a brief overview of Cassandra’s architecture.

Cassandra common terms

Before digging deep into Cassandra's architecture, let's first go through some of its common terms:

Column: A column is a key-value pair and is the most basic unit of data structure.

  • Column key: Uniquely identifies a column in a row.
  • Column value: Stores one value or a collection of values.

Row: A row is a container for columns referenced by primary key. Cassandra does not store a column that has a null value; this saves a lot of space.

Table: A table is a container of rows.

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