Note:  The DBMS System Catalogs and Extended System Catalogs are unsupported and can change at any time. Information about these catalogs is provided solely for your convenience. In providing this information, the company makes no commitment to maintain compatibility with any feature, tool, or interface. The company does not provide support, either through customer support or release maintenance channels, for the resolution of any problems or bugs arising from the use of unsupported features, tools, or interfaces.