What is an Iterator in RocksDB?

An Iterator lets an application traverse a range of keys in sorted order, rather than looking up one key at a time.

• Can be positioned at the beginning, at a specific key via a seek operation, or moved forward and backward through the sorted keyspace
• Transparently merges data from the MemTable and multiple SSTables into one logically sorted sequence
• Can be created against a Snapshot, giving a consistent, ordered view of the data as it existed at that point in time

Iterators are RocksDB's primary tool for range scans, listing all keys with a given prefix, or walking through data in sorted order, tasks a simple key lookup alone can't handle.

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