While each database in DB2 LUW holds its exclusive catalog tables, it is every DB2 subsystem that holds catalog tables. DB2LUW下的每个数据库都拥有其独有的目录表,即每个DB2子系统保存目录表。
The DB2 z/ OS subsystem contains information for establishing connections with remote subsystems in a set of catalog tables called Communication Database ( CDB). DB2z/OS子系统在名为CommunicationDatabase(CDB)的一组目录表中包含与远程子系统建立连接的信息。