What are Column Families in RocksDB?

Column Families let a single RocksDB database instance maintain multiple, independently configured, logically separate key spaces within the same database.

• Each column family can have its own compaction style, comparator, and other tuning options
• All column families in a database share the same underlying write-ahead log, keeping writes across them consistent
• Commonly used to store logically distinct kinds of data, like an index versus the actual records, within a single database instance

This feature is what lets an application avoid running multiple separate RocksDB instances just to keep different categories of data configured and organized differently.

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