What is a Checkpoint in RocksDB?

A Checkpoint creates a lightweight, point-in-time copy of a RocksDB database, typically by hard-linking its current SSTable files rather than physically copying them.

• Extremely fast to create, since it mostly avoids duplicating the underlying immutable data files
• Produces a fully independent, openable database directory, distinct from ongoing backup utilities designed for longer-term storage
• Commonly used for things like taking a quick, consistent snapshot of the data directory before a risky operation

Checkpoints take advantage of the same immutability that makes SSTables safe to share elsewhere in RocksDB's design, letting a nearly free point-in-time copy be created without duplicating gigabytes of data.

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