DB 2 luw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。
While each database in DB2 LUW holds its exclusive catalog tables, it is every DB2 subsystem that holds catalog tables.
但是，对于 REFRESH IMMEDIATE 类型的系统维护的 MQT，可以通过 对底层表的更改（即 insert、update 或 delete 操作）来更新。
However, REFRESH IMMEDIATE system-maintained MQTs are updated with changes made to the underlying tables as a result of insert, update, or delete operations.
抄表系统采用CLIENT-SERVER结构，即采用一台PC服务器带多只下位机抄表仪的方式。
The kilowatt-hour meter reading system adopts CLIENT-SERVER structure that is to use a PC with multiple lower level reading meters method.
应用推荐