owledge base systems, that make the system unlike relational databases:</p>
<ol><li>
		Cyc is not transactional. There are no commit points and no roll-backs.</li>
<li>
		Cyc keeps all change in memory (though it maintains a journal for replay purposes). If not explicitly instructed to serialize its knowledge base, changes made to Cyc may not be available automatically across restarts. In addition, the serialization of the knowledge is considered an infrequent operation and not very fast, compared to the ra