What is an SSTable in RocksDB?

An SSTable, or Sorted String Table, is the immutable, on-disk file format RocksDB uses to store key-value pairs once they're flushed out of memory.

• Stores keys in sorted order, which enables efficient binary search and range scans
• Once written, an SSTable is never modified in place, only replaced or removed through compaction
• Typically includes an index block and, optionally, a Bloom filter to speed up lookups

This immutability is a deliberate design choice, it simplifies concurrency and makes it straightforward to cache and share these files safely across reads.

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