TiKV uses RocksDB internally to store Raft logs and key-value pairs.

    TiKV creates two RocksDB instances on each Node:

    • One rocksdb instance that stores key-value data.
    • One raftdb instance that stores Raft logs and has a single column family called raftdb.defaultcf.

    The rocksdb instance has three column families:

    Column family Purpose
    rocksdb.defaultcf Stores actual KV pairs for TiKV
    rocksdb.lockcf Stores transaction lock
    rocksdb.writecf Stores transactions’ commits and rollback records

    RocksDB can be configured on each column family. Here is an example:

    1. [rocksdb.writecf]
2. whole-key-filtering = false

    For more information about the RocksDB configuration parameters, see RocksDB-related parameters.