Database / RocksDB Basics Interview Questions
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.
What does an Iterator let an application do?
Can an Iterator be created against a Snapshot?
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