Database / RocksDB Basics Interview Questions
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.
What does Prefix Seek let RocksDB efficiently do?
What tells RocksDB how to derive a prefix from a full key?
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