Schema in Cassandra 1.1

Cassandra, a distributed database system, initially followed a "schemaless" data model similar to Google's Bigtable paper. However, as systems grew and matured, the lack of schema became a pain point. Starting with version 0.7, Cassandra allowed users to define their data types, making it "schema-optional." The storage engine in Cassandra is sparse, allowing for easy addition of columns without reallocating space row by row. This flexibility is combined with the benefits of having a defined schema. In upcoming releases, CQL will support defining column families with compound primary keys, which can be useful for denormalizing data and faster queries.

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