@Override
  public SegmentedKeyValueStorageTransaction getSnapshotTransaction() {
    // snapshots are not mutable, return no-op transaction:
    return noOpTx;
  }
Instantiates a new RocksDb columnar key value snapshot.

@param db the db
@param metrics the metrics
plugins/rocksdb/src/main/java/org/hyperledger/besu/plugin/services/storage/rocksdb/segmented/RocksDBColumnarKeyValueSnapshot.java