public void MarkCurrentKeyAsUsed(IKeyValueDBTransaction tr)
{
Keys = Keys.ResizingAppend(ByteBuffer.NewSync(tr.GetKeyPrefix())).ResizingAppend(tr.GetKey());
Builder.Append("Used key: ");
Print(ByteBuffer.NewSync(tr.GetKeyPrefix()));
Builder.Append('|');
Print(tr.GetKey());
Builder.AppendFormat(" Value len:{0}", tr.GetStorageSizeOfCurrentKey().Value);
Builder.AppendLine();
}