/// <summary>
/// Returns the approximate file system space used by keys in "[start .. limit)".
///
/// Note that the returned sizes measure file system space usage, so
/// if the user data compresses by a factor of ten, the returned
/// sizes will be one-tenth the size of the corresponding user data size.
///
/// The results may not include the sizes of recently written data.
/// </summary>
/// <param name="startKey"></param>
/// <param name="limitKey"></param>
/// <returns></returns>
public unsafe long GetApproximateSize(byte[] startKey, byte[] limitKey)
{
IntPtr l1 = (IntPtr)startKey.Length;
IntPtr l2 = (IntPtr)limitKey.Length;
long[] sizes = new long[1];
LevelDBInterop.leveldb_approximate_sizes(Handle, 1, new byte[][] { startKey }, new IntPtr[] { l1 }, new byte[][] { limitKey }, new IntPtr[] { l2 }, sizes);
GC.KeepAlive(this);
return(sizes[0]);
}
