What is Prefix Seek in RocksDB?

Prefix Seek is an iteration technique that lets RocksDB efficiently find and scan all keys sharing a common prefix, without needing to scan through unrelated keys.

• Relies on a configured prefix extractor, which tells RocksDB how to derive a prefix from a full key
• Can use a specialized prefix Bloom filter to quickly skip SSTables that don't contain any keys with the requested prefix
• Commonly used for tasks like listing all keys belonging to a particular category or namespace stored under a shared prefix

This is a practical optimization for a very common access pattern, since without it, finding all keys under a given prefix would otherwise require scanning much more of the keyspace than necessary.

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